To work out how many each of them got, we must first nd up each part of the ratio, to find the total number of divisions. We can then divide the total by this number to get what 1 part is equal. Finally multiply by the original ratio to find out the quantity each received.
1) 1 + 4 = 5
2) 15 / 5 = 3 = 1 Part
3) Gemma = 1 x 3 = 3 biscuits
4) Zak = 4 x 3 = 12 biscuits
Gemma : Zak
3 : 12