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?

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?

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 : 

In a class, 60% speak Hindi and 70% speak English. If 28% of the students can’t speak any of the two languages, then what % of the students in the class can speak both the languages?

A man spend 15% of his income. If his expenditure is Rs.75, his income (in rupees) is: