Area

41 The percentage increase in the area of a rectangle, if each of it's sides is increased by 20%, is

42 A rectangle has width a and length b. If the width is decreased by 20% and the length is increased by 10%, than what is the area of the new rectangle in percentage compared to ab?

43 A tank is 25 m long, 12 m wide and 6 m deep. The cost of plastering it's walls and bottom at 75 paise/m× is

44 If the ratio of areas of two squares is 225 : 256, then the ratio of their perimeters is

45 The perimeters of five squares are 24 cm, 32 cm, 40 cm, 76 cm and 80 cm respectively. The perimeter of another square equal in area to the sum of the areas of these squares is:

46 The perimeter of a triangle is 30 cm and it's area is 30 cm°. If the largest side measures 13 cm, then what is the length of the smallest side of the triangle?

47 A typist uses a sheet measuring 20 cm×30 cm lengthwise. If a margin of 2 cm is left on each side and a 3 cm margin on top and bottom, the per cent of the page used for typing is

48 A rectangular hall 12 m long and 10 m broad, is surrounded by a verandah 2 metres wide. Find the area of the verandah?

49 If the length and breadth of a rectangle are increased by 10% and 8%, respectively, then by what per cent will the area of that rectangle be increased?

50 There is a garden of 140 m×120 m and a gravel path is to be made of an equal width all around it, so as to take up just one-fourth of the garden. What must be the breadth of the path?