Marion had 12 more wafers than Zoe at first. After Marion ate 3 wafers, she had four times as many wafers as Zoe in the end. How many wafers did Zoe have?
| |
Zoe |
Marion |
| Before |
1 u |
1 u + 12 |
| Change |
|
- 3 |
| After |
1 u |
1 u + 9 |
Comparing Zoe
and Marion in the end |
1 u |
4 u |
The number of wafers that Zoe had remains unchanged.
Number of wafers that Marion had in the end
= 4 x 1 u
= 4 u
4 u = 1 u + 9
4 u - 1 u = 9
3 u = 9
1 u = 9 ÷ 3 = 3
Number of wafers that Zoe had
= 1 u
= 3
Answer(s): 3
