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The height of room of the wall is 3 cm. If the length of the room is 25% more than the width of the room, and area of the four walls is 54 cm2, then find the length of the room.

A5 cm

B4 cm

C25 cm

D20 cm

Answer:

A. 5 cm

Read Explanation:

Area of four wall = 2 × h × (l + b) Let the width of the room = x cm length of the room = 125% of x = 1.25x cm 2 × 3 × (1.25x + x) = 54 6 × 2.25x = 54 2.25x = 9 x = 4 cm The length of the room = 125% of 4 = 5 cm


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