Winnie had 17 more wafers than Gem at first. After Winnie ate 3 wafers, she had thrice as many wafers as Gem in the end. How many wafers did Gem have?
| |
Gem |
Winnie |
| Before |
1 u |
1 u + 17 |
| Change |
|
- 3 |
| After |
1 u |
1 u + 14 |
Comparing Gem
and Winnie in the end |
1 u |
3 u |
The number of wafers that Gem had remains unchanged.
Number of wafers that Winnie had in the end
= 3 x 1 u
= 3 u
3 u = 1 u + 14
3 u - 1 u = 14
2 u = 14
1 u = 14 ÷ 2 = 7
Number of wafers that Gem had
= 1 u
= 7
Answer(s): 7
