Henry, Vaidev, Billy and Owen went shopping with a total of $792. After shopping, they had a total of $22 left. Vaidev spent $20. The amount Billy spent was ²₃ the amount spent by Henry. The total amount spent by Henry and Vaidev was $658 less than the total amount spent by Billy and Owen. How much did Henry and Owen spend altogether?

	Henry	Vaidev	Billy	Owen	Total
Before					$792
Change	- 3 u	- $20	- 2 u	- ?	- $770
After					$22

Total amount that Henry, Vaidev, Billy and Owen spent
= 792 - 22
= $770

Total amount that Henry and Vaidev spent
= 3 u + 20

Total amount that Billy and Owen spent
= 3 u + 20 + 658
= 3 u + 678 

Total amount that Henry, Vaidev, Billy and Owen spent
= 3 u + 20 + 3 u + 678
= 6 u + 698 

6 u + 698 = 770
6 u = 770 - 698
6 u = 72 

1 u = 72 ÷ 6 = 12

Total amount that Vaidev and Billy spent
= 2 u + 20
= 2 x 12 + 20
= 24 + 20
= $44

Total amount that Henry and Owen spent
= 770 - 44
= $726

Answer(s): $726