Question

在一根长100厘米的木棍上，

在一根长100厘米的木棍上，自左至右每隔6厘米染一个红点，同时自右至左每隔5厘米也染上一个红点，然后沿所有的红点处将木棍逐段锯开，那么长度是4厘米的短木棍有 条．

Answer 1

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Answer 2

100/6=16.。。。。。。4cm
100/5=20
16和20的最大公约数是4
4+1（右端的一段4cm)=5段