3 cousins, Tina, Rachel and Risa, paid a total of $81 for a souvenir. Tina paid
14 of what the others paid. Rachel paid
18 of what the others paid. How much did Risa pay?
| Tina |
Risa |
Rachel |
Total |
| 1x9 |
4x9 |
5x9 |
| 8x5 |
1x5 |
9x5 |
| 9 u |
31 u |
5 u |
45 u |
Total cost of the souvenir = 45 u
45 u = 81
1 u = 81 ÷ 45 = 1.80
Amount that Risa paid
= 45 u - 9 u - 5 u
= 31 u
= 31 x 1.80
= $55.80
Answer: $55.80
