Answer:
Let the number of machines be x.
Machine 42 x Days 63 54
As no. of days decrease no. of machines increase. Hence, this is a case of inverse proportion. So, no. of machines increase \[x\times 54=42\times 63\] \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,x=\frac{42\times 63}{54}=49\] Thus, 49 machines would be required.
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