Bryan, Zeph, Seth and Jenson went shopping with a total of $816. After shopping, they had a total of $124 left. Zeph spent $20. The amount Seth spent was ⁴₇ the amount spent by Bryan. The total amount spent by Bryan and Zeph was $316 less than the total amount spent by Seth and Jenson. How much did Bryan and Jenson spend altogether?

	Bryan	Zeph	Seth	Jenson	Total
Before					$816
Change	- 7 u	- $20	- 4 u	- ?	- $692
After					$124

Total amount that Bryan, Zeph, Seth and Jenson spent
= 816 - 124
= $692

Total amount that Bryan and Zeph spent
= 7 u + 20

Total amount that Seth and Jenson spent
= 7 u + 20 + 316
= 7 u + 336 

Total amount that Bryan, Zeph, Seth and Jenson spent
= 7 u + 20 + 7 u + 336
= 14 u + 356 

14 u + 356 = 692
14 u = 692 - 356
14 u = 336 

1 u = 336 ÷ 14 = 24

Total amount that Zeph and Seth spent
= 4 u + 20
= 4 x 24 + 20
= 96 + 20
= $116

Total amount that Bryan and Jenson spent
= 692 - 116
= $576

Answer(s): $576