Quantitative Aptitude - Arithmetic Ability Questions

Working 10 hours a day, Aman can complete a piece of work in 18 days. How many hours a day should he work so as to finish the work in 15 days?

If the circumference of a circle is 44 cm, then what must be its area (in cm²)?

Find two numbers such that their mean proportion is 8 and third proportion is 64.

If 90% of A = 30% of B and B = x% of A, find x.

Find the value of sin230 cos245 + 4 tan230 + 1/2sin290 - 2 cos290 + 1/24

If M = 0.1 + (0.1)2 + (0.01)2 and N = 0.3 + (0.03)2 + (0.003)2, then what is the value of M + N?

In the following question, select the odd letter/letters from the given alternatives.

The average of 10 numbers is X and one of the number is 38. If 38 is replaced with 19, then what will be the new average?