Xavier, Ahmad, Jeremy and Paul went shopping with a total of $576. After shopping, they had a total of $168 left. Ahmad spent $90. The amount Jeremy spent was ³₄ the amount spent by Xavier. The total amount spent by Xavier and Ahmad was $100 less than the total amount spent by Jeremy and Paul. How much did Xavier and Paul spend altogether?

	Xavier	Ahmad	Jeremy	Paul	Total
Before					$576
Change	- 4 u	- $90	- 3 u	- ?	- $408
After					$168

Total amount that Xavier, Ahmad, Jeremy and Paul spent
= 576 - 168
= $408

Total amount that Xavier and Ahmad spent
= 4 u + 90

Total amount that Jeremy and Paul spent
= 4 u + 90 + 100
= 4 u + 190 

Total amount that Xavier, Ahmad, Jeremy and Paul spent
= 4 u + 90 + 4 u + 190
= 8 u + 280 

8 u + 280 = 408
8 u = 408 - 280
8 u = 128 

1 u = 128 ÷ 8 = 16

Total amount that Ahmad and Jeremy spent
= 3 u + 90
= 3 x 16 + 90
= 48 + 90
= $138

Total amount that Xavier and Paul spent
= 408 - 138
= $270

Answer(s): $270