Question

A photograph is 20cm long and 15cm wide. The length of a small print of the photograph is 4cm
Find:
A. The width of the small print
B. The ratio of the areas of the two photographs

Answer 1

A. 15 / 20 = w / 4

B. the ratio of the areas is the square of the ratio of the side lengths
... area ratio = (20 / 4)^2