alleryOn a map where 1 cm stands for 5 km, a road measures 3 cm. How long is the real road?
A8 km
B12 km
C15 km
D1.5 km
Answer & Solution
Correct answer: C. 15 km
1. Map distance is directly proportional to real distance, with the scale as the constant.
2. Real length = 3 x 5 km = 15 km.
3. Adding 3 and 5 gives 8, which is not how a scale works.
_Source: Wikipedia, Proportionality (mathematics), Examples_
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