Quantitative Aptitude - Arithmetic Ability Questions

The average age of A and B is 18 years. After 3 years, C joins them and the average ages of A, B and C becomes 22 years. The age of C is ?

Average of two numbers is 8 and average of other three numbers is 3 ; the average of the five numbers is

Average age of a team having 12 players is 23 years. If the age of the coach is also included, then the average age increases by 2 years. What is the age (inyears) of the coach?

Coefficient of x2 in (x + 9)(6 -­ 4x) is

5 bottles cost as much as 2 bags. The cost of 15 bottles and 4 bags is Rs 2,000. What is the price (in Rs.) of a single bag?

If x - y = -6 and x + y = 16, then x2- y2 is?

In a trapezium, one diagonal divides the other in the ratio 2 : 9. If the length of the larger of the two parallel sides is 45 cm, then what is the length (in cm) of the other parallel side?

The price of an article is decreased by 10%. To restore it to its former value, the new price must be increased by