The boys and girls in a school are in the ratio 9:5. If the number of girls are 225 then the no.of boys are. 

A ratio x:y is said to be in simplest form, if HCF of x and y is

In a proportion: 

Product of extremes = ___________ of means. 

The cost of 0.5 of a number equals 0.07 of another. Then the ratio of the two numbers is: 

What must be added to each term of the ratio 7:13 so that the ratio becomes 2:3? 

In a proportion, the first, second and fourth terms are 72, 36, 18. Find the third term.

The first term of a ratio is called 

The ratio of Rs. 5 and Rs. 750 in simplest form is

The cost of 8 copies of a book is Rs. 488. Then the cost of 15 copies of the same book at the same rate is