Carl, Oliver, Riordan and Peter went shopping with a total of $593. After shopping, they had a total of $176 left. Oliver spent $80. The amount Riordan spent was ²₅ the amount spent by Carl. The total amount spent by Carl and Oliver was $27 less than the total amount spent by Riordan and Peter. How much did Carl and Peter spend altogether?

	Carl	Oliver	Riordan	Peter	Total
Before					$593
Change	- 5 u	- $80	- 2 u	- ?	- $417
After					$176

Total amount that Carl, Oliver, Riordan and Peter spent
= 593 - 176
= $417

Total amount that Carl and Oliver spent
= 5 u + 80

Total amount that Riordan and Peter spent
= 5 u + 80 + 27
= 5 u + 107 

Total amount that Carl, Oliver, Riordan and Peter spent
= 5 u + 80 + 5 u + 107
= 10 u + 187 

10 u + 187 = 417
10 u = 417 - 187
10 u = 230 

1 u = 230 ÷ 10 = 23

Total amount that Oliver and Riordan spent
= 2 u + 80
= 2 x 23 + 80
= 46 + 80
= $126

Total amount that Carl and Peter spent
= 417 - 126
= $291

Answer(s): $291