In an examination 60% of the students passed in English and 70% in Mathematics, if 20% of the students failed in both the subjects and 2500 students passed in both the subjects, then what is the total number of candidates?

If the purchase price of an article is equal to 80 percent of its selling price then there will be profit.

If the length of a rectangle is increased by 10% and the area is unchanged, then how much percent does the breadth decrease?

A furniture salesman increased the value of furniture by 20 percent due to the lure of more income, which led to a decrease of 30 percent in his sales, then tell him what percentage was reduced in his income?

Ram sells two articles, each for the same price Rs.720. He incurs 20% loss on the first and 10% loss on the second. Find his overall percent loss.

A student multiplies a number by 5/3 instead of 3/5. What is the percentage error in the calculation?

If x% of $${25\over 2}\%$$ is 150, then the value of x is : 

One-third of 1206 is what percentage of 134?