Question

The area of four walls of a room is 140 cm2. If the length and breadth of the room were equal and the height of the room is 5 cm, then what is the area of the floor? 

A 64 sq.cm Correct Answer Incorrect Answer
B 49 sq.cm Correct Answer Incorrect Answer
C 36 sq.cm Correct Answer Incorrect Answer
D 25 sq.cm Correct Answer Incorrect Answer

Solution

According to question,   => l = b   Area of the wall = 2(l + b)h   => 140 = 2(l + l) × 5 => 140 = 4 × l × 5 => l = 140/20 = 7 cm   Area of the floor = l × b = 7 × 7 = 49 cm2 

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