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What is the least number of soldiers in ...

What is the least number of soldiers in a regiment, such that they stand in rows of 18, 15 and 25 and also form a solid square?

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LCM(18)=2*3*3
LCM(15)=3*5
LCM(25)=5*5
LCM(18,15,25)=450
2*2*3*3*5*5=900.
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