The students of three classes are in the ratio 4 : 6 : 9. If 12 students are increased in each class the ratio changes t…

One - fourth of sixty percent of a number is equal to two - fifths of twenty percent of another number. What is the resp…

If x : y = 3 : 4, then (2x + 3y) : (3y - 2x) would be equal to.`

Present ages of A and B are in the ratio 5 : 6 respectively. After seven years this ratio becomes 6 : 7. Then the presen…

The ratio of water and milk in a 30 liter mixture is 7 : 3. Find the quantity of water to be added to the mixture in ord…

$$\frac{3}{4}$$ : $$\frac{1}{2}$$ :: 27y : ? Solve this -

The present ratio of ages of A and B is 4 : 5. 18 years ago, this ratio was 11 : 16. Find the sum total of their present…

If a : b = b : c, then a<sup>4</sup> : b<sup>4</sup> is equal to = ?