11. The difference between the length and breadth of a rectangle is 23 m. If its perimeter is 206 m, then its area is:
12. The length of a rectangle is halved, while its breadth is tripled. What is the percentage change in area?
13. The length of a rectangular plot is 20 metres more than its breadth. If the cost of fencing the plot @ 26.50 per metre is Rs. 5300, what is the length of the plot in metres?
14. A rectangular field is to be fenced on three sides leaving a side of 20 feet uncovered. If the area of the field is 680 sq. feet, how many feet of fencing will be required?
15. A tank is 25 m long, 12 m wide and 6 m deep. The cost of plastering its walls and bottom at 75 paise per sq. m, is:
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
If the monthly income of family A is Rs. 40000, the monthly income of family B is ?
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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