On a map, 1cm represent 5km. Find the area on the map that represents 100km2.

Options

1. 2cm²
2. 4cm²
3. 8cm²
4. 8cm²

The correct answer is B.

Explanation:

On a map, 1cm represents 5km. Then it follows that 1cm² represents 25km².

Acm²represents 100km². By apparent cross-multiplication, 1cm² x 100km² = Acm²x

25km² therefore A =100/25

A  = 4cm²