The ratio In simplified form of those who both bike and run to those who do neither is 12: 1.
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When two numbers are divided and written in the form p:q then they are called in Ratio.
It can be understood from the data given
The people who run and Bike is 42
The people who do neither is 3
The ratio of those who both bike and run to those who do neither is 42 :3
In simplified form 12: 1
Therefore the ratio In simplified form of those who both bike and run to those who do neither is 12: 1.
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