Quantitative Aptitude - Arithmetic Ability Questions

26% of a number is 65. What is the number?

Expanded and simplification of (x + 3)(x - 1) will be equal to

What is the sum of the first 12 terms of an arithmetic progression if the first term is 3 and last term is 47?

Twenty one times of a positive number is less than its square by 100. The value of the positive number is

If a - b = 3 and a2+b2=25, then the value of ab is

The ratio of the present ages of Reena and her husband is 4 : 5. 8 years from now, ages of her husband and her son will be in the ratio 24 : 9. If the present age of Reena is 32 years, then what will be her son’s present age (in years)?

Average of 31 numbers is 19. If the average of first 8 numbers is 24, then what is the average of the remaining numbers?

The average of 7 numbers is 30. If the average of first three numbers is 25 and that of last three numbers is 35, then what is the fourth number?