Olivia bought five times as many cookies as Glen. After Olivia ate 4 cookies, she had 8 more cookies than Glen. How many cookies did they buy altogether?
| |
Olivia |
Glen |
Total |
| Before |
5 u |
1 u |
6 u |
| Change |
- 4 |
|
|
| After |
5 u - 4 |
1 u |
|
The number of cookies that Glen had remains unchanged.
If Glen had another 8 cookies in the end, the number of cookies that Olivia and Glen had would be the same.
5 u - 4 = 1 u + 8
5 u - 1 u = 8 + 4
4 u = 12
1 u = 12 ÷ 4 = 3
Total number of cookies
= 5 u + 1 u
= 6 u
= 6 x 3
= 18
Answer(s): 18
