Zeph had $1.60 less than Justin. After Zeph gave $3.10 to Justin, Justin would have four times as much money as Zeph. How much money had Justin at first?
| |
Justin |
Zeph |
| Before |
4 u - $3.10 |
1 u + $3.10 |
| Change |
+ $3.10 |
- $3.10 |
| After |
4 u |
1 u |
Zeph had $1.60 less than Justin. If another $1.60 was given to Zeph, Justin and Zeph would have the same amount at first.
4 u - 3.10 = 1 u + 3.10 + 1.60
4 u - 1 u = 3.10 + 1.60 + 3.10
3 u = 7.80
1 u = 7.80 ÷ 3 = 2.60
Amount that Justin had at first
= 4 u - 3.10
= 4 x 2.60 + 3.10
= 10.40 + 3.10
= $13.50
Answer(s): $13.50
