Question

On a map 2 centimeters represents 100 kilometers. How much of a centimeter represents 20 kilometers?

Answer 1

Hello!

2 centimeters = 100 kilometers
x centimeters = 20 kilometers

You can make a proportion

$\frac{2}{100} = \frac{x}{20}$

Cross multiply

20 × 2 = 40

40 ÷ 100 = 4/10 = 2/5 = 0.4

$\framebox{0.4 or 2/5 of a centimeter}$

Answer 2

When 2 cm on a map represents 100 km than 4 mm represents 20 km.

When both 2 cm and 100 km are divided this becomes 0.4 cm=20 km.

0.4 cm is equal to 4 mm.