Steps

Peter makes steps long 70 cm, John 45 cm long. After how many meters their footsteps meet?

Correct result:

x =  6.3 m

Solution:

$$\begin{gathered} 70=2\cdot 5\cdot 7 \\ 45=3\cdot 3\cdot 5 \\ \text{LCM}(70,45)=630 \\ x=630\mathrm{/}100=6.3\text{ m} \end{gathered}$$

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