Question

A grapefruit has a mass of 100 grams a watermelon has a mass of 4 times the mass of the grapefruit what is the mass of the watermelon in centigrams

Answer 1

The grapefruit weighs 100g
If the watermelon weights 4 times this, we multiply by 4
100g x 4 = 400g
Watermelon = 400g
A centigram is 100th of a gram
Therefore to work out how many centigrams it is, we multiply by 100
400 x 100 = 40,000 cg