if 50% of (x-y) =30% of (x+y), then what percentage of x is y?

On subtracting 10 from a number, that number is decreased by 20%, then what is 60% of that number?

A is 80% more than B and C is $$48{4\over 7}\%$$ less than the sum of A and B. By what percent is C less than A?

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?

One-third of 1206 is what percentage of 134?

The price of sugar is increased by 20%. As a result, a family has to decrease its consumption by 20%. The expenditure of the family on sugar is decreased by

if 120% of a is equal to 80% of b, then $${b+a}\over {b-a}$$ is equal to

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