Quantitative Aptitude - Arithmetic Ability Questions

If the average of 31, x, 42, 39, 56, 78, 83 and 91 is 58.5, then what is the value of x?

Read the following information and answer the questions given below:

A has 28 elements, B has 32 elements and A U B has 40 elements.

How many elements does A ∩ B have?

Average of 10 numbers is 14. If each number is multiplied by 6, then what will be the new average?

What is the value of 1054 + 196 + 169 + 64 ?

Find the total surface area (in cm2) of a hemisphere of diameter 21 cm.

22 - 33 + 43 - 62 = ?

If x32 - 1x16 = 5, then find the value of x96 - 1x48.

Find the range of the data 9, 5, 9, 3, 4, 7, 8, 4, 8, 9, 5, 9.