Quantitative Aptitude - Arithmetic Ability Questions

If a -­ b = 6 and ab =16, then a3 -­ b3 is

For the data given below. find the sum of mode. median and mean.6, 3, 8, 4, 3, 11, 7, 4, 5, 4.

The mean of 10 observations is 17. One more observation is included and the new mean becomes 16. The 11th observation is

The addition of a rational number and its reciprocal is 61/30. Calculate the number.

Three pipe P, Q and R can fill a tank in 12 minutes, 18 minutesand 24 minutes respectively. The pipe R is closed 12 minutesbefore the tank is filled. In what time the tank is full?

A cricketer, whose bowling average was 12.4 runs/wicket takes 5 wickets for 22 runs in a match, thereby decreases his average by 0.4. The number of wickets, taken by him before this match was:

Which of the following quadratic equations has real roots?

A and B together can do a piece of work in 36 days, B and C together can do it in 24 days. A and C together can do it in 18 days. The three working together can finish the work in