Three classmates spent a total of $60. Roshel spent $6 more than Penelope and Diana spent $9 more than Roshel.
- How much money did Penelope spend?
- How much money did Diana spend?
(a)
Amount that Penelope spent = 1 u
Amount that Roshel spent = 1 u + 6
Amount that Diana spent = 1 u + 6 + 9 = 1 u + 15
Total amount that they spent
= 1 u + 1 u + 6 + 1 u + 15
= 3 u + 21
3 u + 21 = 60
3 u = 60 - 21
3 u = 39
1 u = 39 ÷ 3 = $13
Amount that Penelope spent
= 1 u
= 13
(b)
Amount that Diana spent
= 1 u + 15
= 13 + 15
= $28
Answer(s): (a) $13; (b) $28
