Question

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.

• A. 5 cm
• B. 4 cm
• C. 25 cm
• D. 20 cm

Answer 1

Answer:

A. 5 cm

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