Gillian and Erika have 220 coins altogether. Erika has four times as many coins as Gillian. How many coins must Erika give to Gillian so that they have the same number of coins?
| |
Gillian |
Erika |
Total |
| Before |
1 u |
4 u |
220 |
| Change |
+ ? |
- ? |
|
| After |
110 |
110 |
220 |
Total number of coins that Gillian and Erika have
= 1 u + 4 u
= 5 u
5 u = 220
1 u = 220 ÷ 5 = 44
Number of coins that Gillian and Erika each has in the end
= 220 ÷ 2
= 110
Number of coins that Erika must give to Gillian
= 110 - 44
= 66
Answer(s): 66
