벌무리수x,x/5목련꽃가고,x/3나팔꽃가고,3(x/3-x/5)협죽도꽃으로날아가고,남은벌의수가1마리이므로,식세우면,x-x/5-x/3-(x/3-x/5)=1. x풀면 15.처음에15마리.
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