A student scored 32 percent and failed by 6 marks. If he had scored 36 percent marks, he would have passed by 2 marks. What is the passing mark?

The ratio 5 : 4 expressed as a percent equals :

A reduction of 20 % in the price of salt enabled a purchaser to obtain 4 kg. more for Rs. 100. The reduced price of salt per kg is :

The sum of the numbers of boys and girls in a school is 150. If the number of boys is x, the number of girls becomes x% of the total number of students. The number of boys is: 

if the monthly salary of a fan employee is increased by $$ 2{2\over 3}\% $$, he gets 72 rupees more. His Monthly salary (in rupees) is:

Salary of a person is first increased by 20 %, then it is decreased by 20 %. Then the percentage change in his salary is: 

In an alloy, there is 12 % of copper, to get 69 kg of copper, how much alloy will be required?