Quantitative Aptitude - Arithmetic Ability Questions

(1155) +(18 − 6) × 9 =?

If a + b = ­ 8 and a2 + b2 = 34, then value of ab is

If a-1a=7,then a2+1a2=?

If 2x-y2+(3y-2z)2=0,then the ratio of x:y:z is

For what value of k, the expression x6– 18x3 + k will be a perfect square?

A dishonest milkman buys milk at Rs 24 per litre and adds 1/3 of water to it and sells the mixture at Rs 32 per litre. What is his gain?

Amit can complete a work in 25 days and Punit can complete the same work in 20 days. Punit alone worked at it for 10 days and then left the work. In how many days will Amit alone complete the remaining work?

The average of marks of 17 students in an examination was calculated as 71. But it was later found that the mark of one student had been wronglyentered as 65 instead of 56 and another as 24 instead of 50. The correct average is