3 sisters, Risa, Fanny and Erika, paid a total of $77 for a present. Risa paid
14 of what the others paid. Fanny paid
16 of what the others paid. How much did Erika pay?
| Risa |
Erika |
Fanny |
Total |
| 1x7 |
4x7 |
5x7 |
| 6x5 |
1x5 |
7x5 |
| 7 u |
23 u |
5 u |
35 u |
Total cost of the present = 35 u
35 u = 77
1 u = 77 ÷ 35 = 2.20
Amount that Erika paid
= 35 u - 7 u - 5 u
= 23 u
= 23 x 2.20
= $50.60
Answer: $50.60
