The question about Xiao Li, Xiao Liu and Xiao Wang going on a trip

Assume that Xiao Li spent You should spend (x+4x/5+8x/15)/3=7x/9 yuan. Because Xiao Wang doesn’t have enough money, so the money he doesn’t have is the average amount spent minus the money Xiao Wang spends, that is, 7x/9- 8x/15=11x/45, 11x/45=88, x=360, that is, Xiao Li spent 360 yuan, Xiao Liu spent 288 yuan, and the average cost was 280 yuan, so Xiao Li wants to get back 360-280=80 Yuan, Xiao Liu got back 288-280=8 yuan, completed

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