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The average of 20, 70 and x is 40. If the average of 20, 70, x and y is 50, then y = ? Correct Answer 80 Here, 20 + 70 + x = 3 x 40 = 120 Now,  20 + 70 + x + y = 4 x 50 or,   y = 200 - (20 + 70 + x) or, y = 200 - 120 So,  y = 80

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What is the total interest on Tk. 800 at 12.5% per annum for 9 months in Taka? Correct Answer 75 9 months = 9/12 year = 3/4 year Interest, I = pnr = 800 x 3/4 x 12.5/100 = 75 taka

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In a mixture of 30 liters, the ratio of acid and water is 7 : 3. How much more water is to be added to get a new mixture containing acid and water in the ratio of 3 : 7? Correct Answer 40 liters Let the amount of water needed be W. Initialy, the mixture contains (7 / (7 + 3) x 30 = 21 liter of acid and 30 - 21 = 9 liter of water. Now,  21 : (9 + W) = 3 : 7 or,  21 / (9 + W) = 3 / 7 or,  3(9 + W) = 21 x 7 or,  27 + 3W = 147 or, 3W = 147 - 27 or, W = 120/3 =  40 liter

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A cricketer has a certain average for 9 innings. In the 10th innings he scores 100 runs, thus increasing his average by 8 runs. What is new average? Correct Answer 28 If original average is A then new average is A + 8. ATQ,   9 x A + 100 = 10 x (A + 8) or,  9A + 100 = 10A + 80 or,  10A - 9A = 100 - 80 or,  A = 20 So, new average = A + 8 = 20 + 8 =  28 runs

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A container is 1/2 full., When 8 gallons is removed the container is 1/10 full. What is the capacity of the container in gallon? Correct Answer 20 Let n be the total capacity of the container. ATQ, n/2 - 8 = n/10 or,n/2 - n/10 = 8 or, 4n = 80 or, n = 20 liters so, 20 liters need to be added to make it full

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Find the number of the divisors of 540. Correct Answer 24 Here, 540 = 2 x 2 x 3 x 3 x 3 x 5 540 has two 2s, three 3s and one 5 among its prime divisors. So, the number of divisors of 540 = (2 + 1) x (3 + 1) x (1 + 1) = 24

Explanation:

The length of the train that takes 8 second to pass a pole when it runs at a speed of 3 km/hr is- Correct Answer 80m ***The question is erroneous. If the speed is 36 km/hr then the solution is as follows: 36 km/hr = 36 x 1000 /3600 m/s = 10 m/s So, the length of the train = 10 x 8 = 80 m.

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Find the number that should be placed in the gap of the series : 80, 96, -, 128 Correct Answer 112 80 + 16 = 96 96 + 16 = 112 112 + 16 = 128

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A man travels 5 miles towards west, 2 miles towards south, then again 5 miles towards west. What is the direct distance of destination from the starting point? Correct Answer 12 miles ***The question is erroneous. The man is 5 + 5 = 10 miles westward an 2 miles southward from his starting point. So, considering a right - angled triangle, his direct distance from the initial point will be (102 + 22)1/2 ≈ 10.2 miles.

Explanation:

পৃথিবীর গভীরতম হ্রদ কোনটি সঠিক উত্তর বৈকাল বৈকাল হ্রদ রাশিয়ার সাইবেরিয়ার দক্ষিণভাগে অবস্থিত একটি সুপেয় পানির হ্রদ। এর উত্তর - পশ্চিম অংশ ইর্কুৎস্ক ওবলাস্ত এবং দক্ষিণ - পূর্ব অংশ বুরিয়াত প্রজাতন্ত্রে পড়েছে। হ্রদটির আয়তন প্রায় ৩১,৫০০ বর্গকিলোমিটার। এটি বিশ্বের গভীরতম হ্রদ। এর সর্বাধিক গভীরতা ১,৬৩৭ মিটার।

Explanation:

Karim can do a job in 15 minutes and his brother takes twice as long to do the same job. If they work together, how long it takes to complete the job? Correct Answer 10 If Karim takes 15 minutes then his brother takes 2 x 15 = 30 minutes to do the job. Together they can complete 1/15 + 1/30 = 3/30 = 1/10 of the job in a minute. So, together they can complete the job in 10 minutes.

Explanation:

In a cash box, there are equal number of 10 paisa, 25 paisa and 50 paisa coins. If it contains Tk. 170, then what is the number of 10 paisa coin? Correct Answer 200 Let's assume that there are 'x' coins of each denomination (10 paisa, 25 paisa, and 50 paisa) in the cash box.The value of x 10 paisa coins = 0.10x TkThe value of x 25 paisa coins = 0.25x Tk The value of x 50 paisa coins = 0.50x TkSo we can write an equation as:0.10x + 0.25x + 0.50x = 170Simplifying this equation, we get:0.85x = 170Dividing both sides by 0.85, we get:x = 200Therefore, there are 200 coins of each denomination in the cash box, and the number of 10 paisa coins is also 200.

Explanation:

The scale of a local map is 1cm to 5km. An area is represented on the map by a rectangle of dimensions 5cm x 9cm. The actual area in km is- Correct Answer 1125 Here, 1cm ≡ 5km Actual dimension = (5x5)km x (9x5)km = 25km x 45km So, the actual area = 25 x 45 km2 = 1125 km2

Explanation:

If 3x + 2y=8 and 2x - y =3, find the value of 4y - 3x. Correct Answer -2 Here,3x+2y=8          2x-y=3if we multiply equation 2 with 2 and add it with equation 1 then we get, 7x=14 or x=2now, 4-y=3 (by substituting x=2 in equation 2)        or, y=1So, 4y-3x=4 - 3*2= -2

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Writing, editing, sorting and printing a document using computer software are known as- Correct Answer word processing Word Processing is using a computer to create, edit, and print documents. Of all computer applications, word processing is the most commonly used.

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In a computer program, the processor executing the same instructions over and over is called- Correct Answer Looping In computer science, a loop is a programming structure that repeats a sequence of instructions until a specific condition is met.

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In Ms Word Pressing CTRL+E will- Correct Answer make center alignment Center text, if you want to quickly center your text, you don't have to use the alignment buttons at the top of your screen. Hit Ctrl + E and your text will be instantly centered

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How many bits are there in a byte? Correct Answer 8 In computer architecture, 8 - bit integers, memory addresses, or other data units are those that are 8 bits (1 octet) wide. Also, 8 - bit CPU and ALU architectures are those that are based on registers, address buses, or data buses of that size. '8 - bit' is also a generation of microcomputers in which 8 - bit microprocessors were the norm.

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Which protocol is used for the internet access? Correct Answer TCP/IP The Internet Protocol (IP) is the principal communications protocol in the Internet protocol suite for relaying datagrams across network boundaries. Its routing function enables internetworking, and essentially establishes the Internet. IP has the task of delivering packets from the source host to the destination host solely based on the IP addresses in the packet headers.

Explanation:

What does RAM stand for? Correct Answer Random Access Memory In computer terms, RAM stands for Random Access Memory. It is a type of computer memory that can be accessed randomly, which means that any byte of memory can be accessed without having to access the previous bytes first. RAM is a temporary storage area that holds data and instructions for the CPU (Central Processing Unit) to process. The data stored in RAM is volatile, which means that it is lost when the computer is turned off or restarted. RAM is an essential component of a computer system as it allows the CPU to access data and instructions quickly, which results in faster processing speeds.

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When you start a computer, then which component works first? Correct Answer BIOS BIOS (basic input/output system) is the program a computer's microprocessor uses to start the computer system after it is powered on. It also manages data flow between the computer's operating system (OS) and attached devices, such as the hard disk, video adapter, keyboard, mouse and printer.

Explanation:

Magnetized bits on a disk surface are arranged along concentric rings are known as Correct Answer tracks হার্ডডিক্স অনেকগুলো গোল চাকতির সমন্বয়ে গঠিত। এই চাকতি আবার কিছু গোলাকার অংশে বিভক্ত যাদেরকে Tracks বলে এবং এই Tracks গুলোকে আবার ছোট ছোট অংশে ভাগ করা হয় যাদেরকে সেক্টর (Sector) বলে। কয়েকটি সেক্টরকে একত্রে ক্লাস্টার (Cluster) বলে। সুতরাং উত্তরঃ Tracks.

Explanation:

In general 'My Documents' is located at- Correct Answer C drive Most folks use the My Documents folder to keep all their personal data. Unfortunately, this folder is by default located on the C: drive, the same drive that contains the Windows operating system.