Question

Mrs Perry shares out 15 biscuites between Gemma and Zak in the ratio 1:4 How many biscuites do they get each? Gemma: Zak

Answer 1

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

Answer 2

Number of biscuits shared by Mrs Perry = 25
ratio in which the biscuits were shared between Gemma and Zak = 1:4
Let us assume the common ratio = x
then
x + 4x = 15
5x = 15
x = 3
Then
The number of biscuits that Gemma got = 3
The number of biscuits that Zak got = 4x
                                                          = 4 * 3
                                                           = 12
So
Gemma: Zak = 3:12
I hope the procedure is clear enough for you to understand.