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At a representative fraction of 1/25 000, one centimetre on the drawing stands for

  • A.25 000 m
  • B.250 m
  • C.25 m
  • D.2500 m

Answer: B

Correct answer: 250 m

At 1/25 000 the drawing length is one twenty-five-thousandth of the real one, so \[ 1\ \mathrm{cm} \rightarrow 25\,000\ \mathrm{cm} = 250\ \mathrm{m}. \] The conversion from centimetres to metres is where the arithmetic usually goes wrong; keeping both lengths in centimetres until the last step avoids it.

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