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Question

The LCM of two numbers is 45 times theirHCF . If one of the numbers is 225 and sum of their LCM and HCF is 1150, find the theother number.

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Solution

Let the LCM be x
The HCF is 45×x=45x
Sum of LCM and HCF x+45x=115046x=1150x=115046x=25
So LCM is 25 and HCF is 45×25=1125
Let a,b be two numbers
We know that ab=LCM×HCF225×b=25×1125b=28125225b=125
So the other number is 125

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