天津公务员考试行测数学运算习题及答案(7)
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【例题】有一批12米长的钢管，现在要截出5米长的毛坯60根，2米长的毛坯60根，至少要多少根钢管?
A.25 B.30 C.35 D.40
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【解析】C。应尽量选择没有残料的方案。先用30根钢管截出5米长的毛坯60根，2米长的毛坯30根，再用5根钢管截出2米长的毛坯30根，所以至少要35根钢管。
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