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

  • A 2cm2
  • B 4cm2
  • C 8cm2
  • D 8cm2
waec 2016mathematics

The correct answer is B. 4cm2

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

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