3 brothers, Risa, Erika and Betty, paid a total of $144 for a gift. Risa paid
14 of what the others paid. Erika paid
17 of what the others paid. How much did Betty pay?
| Risa |
Betty |
Erika |
Total |
| 1x8 |
4x8 |
5x8 |
| 7x5 |
1x5 |
8x5 |
| 8 u |
27 u |
5 u |
40 u |
Total cost of the gift = 40 u
40 u = 144
1 u = 144 ÷ 40 = 3.60
Amount that Betty paid
= 40 u - 8 u - 5 u
= 27 u
= 27 x 3.60
= $97.20
Answer: $97.20
