设总数X5X/12+30+7X/16+5=X40X+42X-96X=-35*96-14X=-3360X=240桃：240x5/12+30=130箱梨：240x7/16+5=110箱
(30 + 5) ÷ (1 - 5/12 - 7/16) = 240 箱240 x5/12 + 30 = 130 箱..........桃子240 - 130 = 110 箱..................梨
