16.
The length of a room is 5.5 m and width is 3.75 m. Find the cost of paving the floor by slabs at the rate of Rs. 800 per square metre.

17.
An artist has completed one-fourth of a rectangular oil painting. When he paint another 100 square centimetres of the painting, he would complete three-quarters of the painting. If the height of the oil painting is 10 cm, determine the length (in cm) of the oil panting.

18.
The length of a rectangle is increased by 60%. By what percent would the width have to be decreased so as to maintain the same area ?

19.
The following squares represent the monthly income of two families
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If the monthly income of family A is Rs. 40000, the monthly income of family B is ?

20.
What will be the length of the diagonal of that square plot whose area is equal to the area of a rectangular plot of length 45 metres and breadth 40 metres ?

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