the area of four walls of a room is 120 m square if the length of the room is twice its breadth and height is 4 metre find the area of the floor
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Area of 4 walls = 2 (L+B)×H
120 = 2 (L+B) × 4
120/8 = L+B
15 = L+B ------------eq1
Given L = 2B
Now put value of L into eq 1
2 B +B = 15
B= 15/3 = 5
Now put B in eq1
L+5 = 15
L = 10
Area of floor = L×B
= 10 × 5
= 50sq.cm
120 = 2 (L+B) × 4
120/8 = L+B
15 = L+B ------------eq1
Given L = 2B
Now put value of L into eq 1
2 B +B = 15
B= 15/3 = 5
Now put B in eq1
L+5 = 15
L = 10
Area of floor = L×B
= 10 × 5
= 50sq.cm
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