Nathan and Sofia shared $30 equally. How much money must Nathan give to Sofia so that Sofia will have four times as much money as Nathan?
| |
Nathan |
Sofia |
Total |
| Before |
15 |
15 |
30 |
| Change |
- 9 |
+ 9 |
|
| After |
1 u |
4 u |
30 |
Amount that each of them had at first
= 30 ÷ 2
= $15
Amount that Nathan had = 1 u
Amount that Sofia had = 4 u
Total amount that Nathan and Sofia
= 1 u + 4 u
= 5 u
5 u = 30
1 u = 30 ÷ 5 = 6
Amount that Nathan must give to Sofia
= 15 - 6
= $9
Answer(s): $9
