One number x is thrice the other number y. If the sum of both the numbers is 20, then what is the values of x and y are respectively ?

A person has some coins of ₹10, ₹5, and ₹2 denominations. The ratio of the products of the numbers of ₹10 and ₹5 coins, the numbers of ₹5 and ₹2 coins, and the numbers of ₹2 and ₹10 coins is 3: 4: 2 respectively. What could be the minimum amount of money this person has? 

What number must be subtracted from each of the numbers 55, 23, 43 and 19, so that the new values are in proportion? 

S is 20% more than T. T is 10% less than U. What is the ratio of S to ?

If P : Q = 4 : 5 and P : R =2 : 3, then what is 3P : 4Q : 5R?

In 80 litres mixture of milk and water the ratio of amount of milk to that of amount of water is 7: 3. In order to make this ratio 2: 1, how many litres of water should be added?

The ratio of the number of hens to the number of goats on farm A is 5: 4 and that on farm B is 5 : 7. What could be the ratio of the total number of hens to the total number of goats in farms A and B taken together?

Two successive discounts of 20% and 30% are given while selling an article. What is the ratio of the marked price of the article to its selling price?