Quantitative Aptitude - Arithmetic Ability Questions

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?

If 2x2+2y2=4a the find the value of 2ax2-a+2ay2-a

Find the volume (in cub.cm) of a sphere of diameter 42 cm

A boy in a train notices that he can count 31 telephone posts in 60 seconds. the distance between two posts is 60 meters. Calculate the speed of the train?

If the profit is 20%, then what will be the ratio of cost price to selling price respectively?

Find the median, mode and mean of 9, 5, 8, 9, 9, 7, 8, 9, 8.

In a ∆ABC, BC is extended upto D, ∡ACD =120°, ∡B = 1/2 A. Then ∡A is

If compound interest received on a certain amount in the 3rd year is Rs. 1,240, what will be the compound interest (in Rs) for the 4th year on the same amount at 9% rate of interest?