Quantitative Aptitude - Arithmetic Ability Questions

U, V and W together can make a chair in 20 minutes. U and V together can make it in 25 minutes. How much time will (in minutes) W alone take to make the chair?

What will be the average of all the prime numbers before 19?

Simple interest on a sum of Rs 50200 for 3 months is Rs 1380.5. What is the rate (in percentage) of interest per annum?

If √x ­- √y = 1 , √x + √y = 17 then √xy = ?

If Sinx = 4/5, then Sec2x - 1 = ?

Select the odd word/letters/number/number pair from the given alternatives.

Select the odd word/letters/number/number pair from the given alternatives.

Select the odd word/letters/number/number pair from the given alternatives.