Gwen had 13 more wafers than Esther at first. After Gwen ate 5 wafers, she had thrice as many wafers as Esther in the end. How many wafers did Esther have?
| |
Esther |
Gwen |
| Before |
1 u |
1 u + 13 |
| Change |
|
- 5 |
| After |
1 u |
1 u + 8 |
Comparing Esther
and Gwen in the end |
1 u |
3 u |
The number of wafers that Esther had remains unchanged.
Number of wafers that Gwen had in the end
= 3 x 1 u
= 3 u
3 u = 1 u + 8
3 u - 1 u = 8
2 u = 8
1 u = 8 ÷ 2 = 4
Number of wafers that Esther had
= 1 u
= 4
Answer(s): 4
