Question 34
Ratio, Percentages and RatesThe student measured the length of a room and obtained the measurement of 3.99m. If the percentage error of his measurement was 5% and his own measurement was smaller than the length, what is the length of the room?
- A.3.78m
- B.3.80m
- C.4.18m
- D.4.20m
- E.4.788m.
Show the answer and explanation
Answer: D (4.20m)
Explanation
His reading is 5% less than the true length L, so 0.95L = 3.99 and L = 3.99 ÷ 0.95 = 4.20 m.