Aptitude [TCS Placement]: Sample Questions 86 - 88 of 174
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Question 86
Write in Short Short Answer▾
The average of a list of 6 numbers is 20. If we remove one of the numbers, the average of the remaining numbers is 15. What is the number that was removed?
EditExplanation
- Average of 6 numbers is 20.
- So, total of numbers will be,
- If we remove one of the numbers, then average of remaining 5 numbers will be 15.
- So, total of numbers will be,
- We are asked to find the removed number.
Question 87
Question MCQ▾
3 men finish painting a wall in 8 days. Four boys do the same job in 7 days. In how many days will 2 men and 2 boys working together paint two such walls of the same size?
Choices
Choice (4) | |
---|---|
a. | 3 days |
b. | 12 days |
c. | 6 days |
d. | 9 days |
Answer
c.Explanation
- 3 men can paint a wall in 8 days, while to paint this same wall 4 boys are needed.
- So, 3 men = 4 boys
- 1 man = boys
- We are asked to find the number of days required to paint the wall by 2 men and 2 boys together.
- 2 men = boys
- 2 men + 2 boys = boys + 2 boys
= boys
- 4 boys can complete work in 7 days.
- boys can complete the same work in (?) days
- So, 2 men and 2 boys can paint wall in 6 days.
Question 88
Write in Short Short Answer▾
Find out the largest prime number that can be stored in 8 bit memory.
EditExplanation
- = 256, prime no less than 256 i.e.. 251
- In a memory user can store data from 0 to
- Where, n = total number of bits
- Here, in 8 bit memory, user can store data between 0 to
- = 256, i.e.. user can store data between 0 to 255.
- So, maximum possible value that can be stored in 8 bit memory is 255.
- We are asked to find the largest prime number, which will be 251, as 255 is not a prime number.
- Prime number: A number which is divisible by itself and one is known as prime number.