Quantitative Aptitude - Arithmetic Ability Questions

A vendor buys 12 bananas for Rs 60 and sells 5 bananas for Rs 32. What will be his gain (in %)?

The reciprocal of the sum of the reciprocals of 8/7 and 5/6 is:

The first and last terms of an arithmetic progression are 23 and ­42. What is the sum of the series if it has 14 terms?

Mr. Raghav taught Geometry for 36 hours. If the time taken in teaching Ratio consitutes one-fourth of the time for Arithmetic, then for how much time (in hours) did he taught the topic of Ratio?

In the following question, select the odd number pair from the given alternatives.

A bag has Rs 20 in the form of 1­-rupee, 50­-paise and 10­-paise coins in the ratio of 2:3:5. Find the number of 50­-paise coins.

If α + β = 90° and α:β = 2:1, then the ratio of cosα to cosβ is

If sec -5π/4 = x, then the value of x is