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:

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