On a drawing at scale 1:100, a room is shown as a rectangle 5 cm by 4 cm. What is the real area of the room?
Answer and explanation
Correct answer: B. 20 square metres
- Step 1: Each real side is 100 times longer: 5 cm becomes 500 cm = 5 m, and 4 cm becomes 4 m. Step 2. Area = 5 x 4 = 20 m2. Answer: 20 square metres. Why not the others: The wrong options apply the scale incorrectly to the area or confuse centimetres with metres.
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