Quantitative Aptitude - Arithmetic Ability Questions

The average marks obtained by a group of 16 students was 20. One student left the group as a result of which the average of the remaining students rose to 21. But another student joined, as a result of which the average marks of the group dropped a bit and became 20.5. What was the average marks obtained by the student who left and the one who joined?

A sum of Rs. 3000 amounts to Rs. 6000 in two years at compound interest. The interest for four years is

The average of 3 consecutive even numbers is A. If next 5 even numbers are added, then what is the average of these 8 numbers?

What is the measure (in degree) of an exterior angle of a regular polygon of 9 sides?

If cos 45° - ­ sec 30° = x, then value of x is

What number should be added to each of the numbers 55, 100, 65 and 116, so that the resulting numbers are in continued proportion?

Choose the odd word/letters/number/number pair from the given alternatives.

In a committee there are 25 members. If two members whose ages are 64 years and 40 years are replaced by the two new members, then average age of 25 members is decreased by 2 years. What is the average age (in years) of the new members?