Question

5 biscuits cost 30p altogether how much do 7 biscuits cost?

Answer 1

First we want to find how much an individual biscuit costs.
If 5 biscuits costs 30p, then
5 x 1 biscuit = 30p
divide both sides by 5
1 biscuit = 6p

If one biscuit costs 6p, and we want to know how much 7 biscuits cost, then:

7 x 6p =42p

7 biscuits costs 42 p