Quantitative Aptitude - Arithmetic Ability Questions

For what value of 'y', x2 + 112x + y2 is a perfect square?

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

A shopkeeper marks up his wares by 60% and offers 25% discount. What will be the selling price (in Rs) if the cost price is Rs 1600?

When [x + (1/x)] = 5, then what is the value of [x – (1/x)]?

The difference between compound interest and simple interest on a certain sum of money for 2 years at 5% per annum is Rs. 41. What is the sum of money?

If a + b = 17 and a - b = 9 then the value of (4a2 + 4b2) is,

If ΔABC is an equilateral triangle of side 16 cm, then the length of altitude is

The simple and compound interest that can be earned in two years at the same rate is Rs 1,000 and Rs 1,040 respectively. What is the rate (percent per annum) of interest?