Quantitative Aptitude - Arithmetic Ability Questions

The average of marks obtained by 100 candidates in a certain examination is 30. If the average marks of passed candidates is 35 and that of the failed candidates is 10, what is the number of candidates who passed the examination?

Convert decimal number 101 to binary.

One of the two inlet pipes works twice as efficiently as the other. The two, working alongside a drain pipe that can empty a cistern all by itself in 8 hours, can fill the empty cistern in 8 hours. How many hours will the less efficient inlet pipe take to fill the empty cistern by itself?

A can do a piece of work in 8 days and B can do it in 10 days seperately. How many days would it take for both A and B to finish the same work together?

The total surface area of a hemisphere is 462 sq cm, what is its curved surface area? (Take π = 22/7)

What is the reflection of the point (2, 3) in the line y = 4?

A ladder 20 m long is leaning against a vertical wall. It makes an angle of 30 deg with the ground. How high on the wall does the ladder reach?

Find the odd word/letters/number from the given alternatives.