The ratio of 45% of 80% of A to 30% of 40% of B is 15: 4. If the average of A and B is 67.5, what is the value of AB?

If the cost price of 15 tables is equal to the selling price of 20 tables. The loss percent is:

 In a test consisting of 140 Questions, a candidate correctly answered 70% of the first 80 questions. What percentage of the remaining questions does the candidate need to correctly answer to score 60% in the test?

If X is 20% less than Y, then find the value of $${Y-X\over Y}$$ and $${X\over X-Y }$$

What will be the change in the volume of a rectangular solid by increasing its length by 10 percent and decreasing its width by 10 percent?

Population of a city is 7000. In next year the population is increased by 8%, then find the new population?

The difference of two numbers is 15 % of their sum. the ratio of the larger number to the smaller number is: 

A book seller allowed 10 % discount on printed price. He gets 30 % commission from publisher. His profit in percent will be?