Question

The photo is 120 mm ×90 mm. It is enlarged to 360 mm × 270 mm. The elephant's tail in the smaller photo is 15 mm long. How long is its tail in the larger photo? Show your calculations.

Answer 1

Let $h=$ the elephant's tail in the larger photo.

$$\dfrac{360\ mm}{120\ mm}=3=\dfrac{270\ mm}{90\ mm}$$ $$\dfrac{h}{15\ mm}=3$$

$$h=45\ mm$$

The elephant's tail in the larger photo is 45 mm long.