A school has 630 students. The ratio of number of boys to number of girls is 3:2. This ratio changes to 7:5 after the admission of 90 new students. Find newly admitted boys.

Sum of two angles of a triangle is 90° and their difference is 50°. Find all the angles of the triangle.

In a 3 - digit number unit's digit, ten's digit and hundred's digit are in the ratio 1:2:3. If the difference of an original number and the number obtained by reversing the digits is 594. Find the number.

The ages of Leena and Heena are in the ratio 7:5. Ten years hence the ratio of their ages will be 9:7. Find their present ages.

Reema's mother is now three times as old as Reema's present age. After 2 years her mother will be 10 years more than twice Reema's present age. Find their ages.