Quantitative Aptitude - Arithmetic Ability Questions

What is that least digit that must be added to the product 5786 × 5784 to make it a perfect square?

The smallest number that must be subtracted from 2800 so that the obtained number is a perfect square is

A and B together can do a piece of work in 12 days while A alone can do the same work in 30 days. B alone can do it in

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:

A car can cover 350 km in 4 hrs. If its speed is decreased by 12.5 kmph. How much time does the car take to cover a distance of 450 kms.

The list price of an article is Rs. 900. It is available at two successive discounts of 20% and 10% . The selling price of the article is:

If tan π/3c + cosec π/6c = x, then x is

The mean of a distribution is 20 and the standard deviation is 4. What is the value of the coefficient variation?