Mary had
57 as much money as Fanny. Mary received another $31 from her mother and Fanny received $8 from her uncle. In the end, Mary had $7 more than Fanny. How much did the girls have altogether in the end?
| |
Mary |
Fanny |
| Before |
5 u |
7 u |
| Change |
+ 31 |
+ 8 |
| After |
5 u + 31 |
7 u + 8 |
If Fanny received another $7 in the end, she would have the same amount of money as Mary.
7 u + 8 + 7 = 5 u + 31
7 u + 15 = 5 u + 31
7 u - 5 u = 31 - 15
2 u = 16
1 u = 16 ÷ 2 = 8
Amount that the girls had in the end
= 5 u + 31 + 7 u + 8
= 5 u + 7 u + 31 + 8
= 12 u + 39
= 12 x 8 + 39
= $135
Answer(s): $135
