Risa had
35 as much money as Shiyun. Risa received another $39 from her father and Shiyun received $9 from her mother. In the end, Risa had $6 more than Shiyun. How much did the girls have altogether in the end?
| |
Risa |
Shiyun |
| Before |
3 u |
5 u |
| Change |
+ 39 |
+ 9 |
| After |
3 u + 39 |
5 u + 9 |
If Shiyun received another $6 in the end, she would have the same amount of money as Risa.
5 u + 9 + 6 = 3 u + 39
5 u + 15 = 3 u + 39
5 u - 3 u = 39 - 15
2 u = 24
1 u = 24 ÷ 2 = 12
Amount that the girls had in the end
= 3 u + 39 + 5 u + 9
= 3 u + 5 u + 39 + 9
= 8 u + 48
= 8 x 12 + 48
= $144
Answer(s): $144
