List of top General Aptitude Questions on Ratio

What is the fourth proportional to $\sqrt{6}$, $\sqrt{8}$ and $\sqrt{21}$ ?

A shopkeeper sells an item at a 20 % discount on the marked price and still makes a 25 % profit. If the marked price is 500 rupees, what is the cost price of the item?

If the ratio of the ages of A and B is 3:5 and their sum is 40 years, what is the age of B?

In a class of 50 students, 30 play football, 25 play cricket, and 10 play both. How many students play neither?

In an 80-litre mixture of milk and water, the ratio of milk to water is 7 : 3. To make this ratio 2 : 1, how many litres of water should be added?

If A : B = 5 : 6 and B : C = 6 : 7, then A + B : B + C : A + C is: