## 16. What will come in the place of (?) in the expression below :

x% of y is y% of (?)

x% of y is y% of (?)

## 17. In the expression xy^{2} , the value of both variables x and y are decreased by 20%. By this, the value of the expression is decreased by :

^{2}, the value of both variables x and y are decreased by 20%. By this, the value of the expression is decreased by :

## 18. The value of a machine depreciates at the rate of 12 percent per annum. It was purchased three years ago. Its present value is Rs. 29644.032. What was the purchase price of the machine ?

## 19. From 5 litres of a 20% solution of alcohol in water, 2 litres of solution is taken out and 2 litres of water is added to it. Find the strength of alcohol in the new solution.

## 20. A man ordered a length of rope by telephone from his nearest hardware shop. But when a worker in the shop brought the rope, he found that the man on the telephone had miswritten the order by interchange feet and inches. As a result of this, the length of rope received was only 30% of the length he had ordered. The length of the rope which the man ordered was between :

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