数学题：甲乙丙三个修路队共同修完一条公路。甲队说完成了全部任务的一半，乙队修了120米，丙队比乙队多修了50%，这条公路长多少米？

数学题解答：

先算出丙队修了多少米？120×（1+50%）＝180（米）

再算出乙丙两队一共修多少米？120+180＝300（米）

乙丙两队修的占这条公路的几分之几？1　-　1/2　＝1/2

这条公路的长是多少米？300　÷　1/2　＝300（米）

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