Erika bought five times as many puffs as Harry. After Erika ate 5 puffs, she had 7 more puffs than Harry. How many puffs did they buy altogether?
| |
Erika |
Harry |
Total |
| Before |
5 u |
1 u |
6 u |
| Change |
- 5 |
|
|
| After |
5 u - 5 |
1 u |
|
The number of puffs that Harry had remains unchanged.
If Harry had another 7 puffs in the end, the number of puffs that Erika and Harry had would be the same.
5 u - 5 = 1 u + 7
5 u - 1 u = 7 + 5
4 u = 12
1 u = 12 ÷ 4 = 3
Total number of puffs
= 5 u + 1 u
= 6 u
= 6 x 3
= 18
Answer(s): 18
