There are wild fruits that monkeys like to eat in the forest. 23 monkeys can eat them all within 9 weeks, and 21 monkeys can eat them all within 12 weeks. If 33 monkeys eat together, how many weeks will it take to eat all the wild fruits Light. (assuming that the growth rate of the wild fruit is constant)
林子里有猴子喜欢吃的野果，23只猴子可在9周内吃光，21只猴子可在12周内吃光，那么如果有33只猴子一起吃，则需要多少周可将野果吃光．(假定野果生长的速度不变)
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