Opal bought four times as many croissants as Cole. After Opal ate 7 croissants, she had 11 more croissants than Cole. How many croissants did they buy altogether?
| |
Opal |
Cole |
Total |
| Before |
4 u |
1 u |
5 u |
| Change |
- 7 |
|
|
| After |
4 u - 7 |
1 u |
|
The number of croissants that Cole had remains unchanged.
If Cole had another 11 croissants in the end, the number of croissants that Opal and Cole had would be the same.
4 u - 7 = 1 u + 11
4 u - 1 u = 11 + 7
3 u = 18
1 u = 18 ÷ 3 = 6
Total number of croissants
= 4 u + 1 u
= 5 u
= 5 x 6
= 30
Answer(s): 30
