31.
When water is changed into ice, its volume increases by 9%. If ice change into water, the percentage decrease in volume is :

32.
A tree increases annually by $$\frac{1}{8}$$ of its height. By how much will it increase after $$2\frac{1}{2}$$ years if it stands today 8 m high ?

33.
How many litres of a 30% alcohol solution should be added to 40 litres of a 60% alcohol solution to prepare a 50% solution ?

34.
Solve [180% of (?)] ÷ 2 = 504

35.
The marked price of an article is Rs. 2400. The shopkeeper gives successive discounts of x% and 15% to the customer. If the customer pays Rs. 1876.80 for the article, find the value of x :

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