Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the odd word from the given alternatives.

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

If x+1x=-2,then the value of x7+1x7

In the following question, select the odd letters from the given alternatives.

Dev lent Rs. 8000 to Jairam for 17 years and Rs. 4700 to Karnik for 16 years on simple interest at the same rate of interest and received Rs. 21120 in all from both of them as interest. The rate of interest per annum is:

A used two-wheeler dealer sells a scooter for Rs 46,000 and makes some loss. If he had sold it for Rs 58,000 his profit would have been double his loss. What was the cost price (in Rs) of the scooter?

The marked price of a calculator is Rs 750. It is sold at a discount of 22%. If the cost price of the calculator is Rs 500, then what is the profit (in Rs)?

If x +y = √3 and x - y = √2, then the value of 8xy (x2 + y2) is