3 sisters, Irene, Cathy and Risa, paid a total of $156 for a souvenir. Irene paid
12 of what the rest paid. Cathy paid
17 of what the rest paid. How much did Risa pay?
Irene |
Risa |
Cathy |
Total |
1x8 |
2x8 |
3x8 |
7x3 |
1x3 |
8x3 |
8 u |
13 u |
3 u |
24 u |
Total cost of the souvenir = 24 u
24 u = 156
1 u = 156 ÷ 24 = 6.50
Amount that Risa paid
= 24 u - 8 u - 3 u
= 13 u
= 13 x 6.50
= $84.50
Answer: $84.50