Discussion
A scale of representative fraction 1/500 to read a maximum of 60 m must be constructed to a length of
Answer: C
Correct answer: 12 cm
The length of scale is the maximum length multiplied by the representative fraction, both in the same units: \[ 60\ \mathrm{m} = 6000\ \mathrm{cm}, \qquad \frac{6000}{500} = 12\ \mathrm{cm}. \] A convenient result - a scale much longer than about 30 cm becomes awkward to use, which is one practical check on the choice of representative fraction.
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