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

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

Correct Answer: Option B

Explanation

On a map, 1cm represents 5km. Then it follows that 1cm² represents 25km². Acm² represents 100km². By apparent cross-multiplication, 1cm² x 100km² = Acm²x 25km²
therefore A = (frac{100}{25}) = 4cm²