On a scale drawing with a scale of 1 cm: 3 m, the height of a tree is 5 cm. How tall is the actual tree?

1cm: 3cm

X both by 5

5cm:15cm the actual tree would be 15 meters

In 3 metres there are 300 centimetres. Each centimetre on the scale is 300 centimeters, or a ratio of 1:300. The tree is 5 centimetres on the scale. Each centimeter on the scale is 300 centimetres, therefore 5 centimetres on the scale is 1500 centimetres. 1500 centimetres is equal to 15 metres.