Three sisters spent a total of $89. Kathy spent $7 more than Roshel and Abi spent $15 more than Kathy.
- How much money did Roshel spend?
- How much money did Abi spend?
(a)
Amount that Roshel spent = 1 u
Amount that Kathy spent = 1 u + 7
Amount that Abi spent = 1 u + 7 + 15 = 1 u + 22
Total amount that they spent
= 1 u + 1 u + 7 + 1 u + 22
= 3 u + 29
3 u + 29 = 89
3 u = 89 - 29
3 u = 60
1 u = 60 ÷ 3 = $20
Amount that Roshel spent
= 1 u
= 20
(b)
Amount that Abi spent
= 1 u + 22
= 20 + 22
= $42
Answer(s): (a) $20; (b) $42
