Cody had $30 more than Tammy. After Tammy spent
15 of her money, Cody had twice as much money as Tammy. How much money did Cody have at first?
| |
Cody |
Tammy |
| Before |
8 u |
5 u |
| Change |
|
- 1 u |
| After |
8 u |
4 u |
Amount that Cody had in the end
= 2 x 4 u
= 8 u
If Tammy had another $30 at first, the amounts that Cody and Tammy each had at first will be the same.
8 u = 5 u + 30
8 u - 5 u = 30
3 u = 30
1 u = 30 ÷ 3 = 10
Amount Cody had at first
= 8 u
= 8 x 10
= $80
Answer(s): $80
