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H.C.F. of two numbers=9
L.C.M. of two numbers=270
First number=45
.·. Second number×First number=H.C.F.×L.C.M
⇒ Second number×45=9×270
⇒ Second number= \frac{9×270}{45}
⇒ Second Number= \frac{2430}{45}
⇒ Second Number=54

Hence the second number is 54.
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