Barbara had twice as much money as Shiyun. After Barbara spent $12 and Shiyun spent $5, Barbara had $18 more than Shiyun. How much did Barbara have in the end?
| |
Barbara |
Shiyun |
| Before |
2 u |
1 u |
| Change |
- $12 |
- $5 |
| After |
2 u - $12 |
1 u - $5 |
Comparing Barbara
and Shiyun
in the end |
$18 more |
|
If Shiyun was given another $18, the amounts that Barbara and Shiyun each had in the end would be the same.
2 u - 12 = 1 u - 5 + 18
2 u - 1 u = 12 + 13
1 u = 25
1 u = 25 ÷ 1 = 25
Amount that Barbara had in the end
= 2 u - 12
= 2 x 25 - 12
= 50 - 12
= $38
Answer(s): $38
