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This requires the highest common factor of 54 and 72.

First split into prime factors: 54 = 2*(3^3)


Multiply together common prime factors: 2*3*3 = 18

18 is the HCF of 54 and 72.

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Q: Which can be the greatest weight that can be used a number of times to weigh 54kg and 72kg of rice?
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