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Question

The reciprocal ratio of 312:612 is

A
132:72
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B
213:27
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C
72:132
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D
72:132
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Solution

The correct option is A 132:72
We first simplify the given ratio 312:612 by converting the mixed fractions in the antecedent and the consequent.
Thus, 312:612=72:132.
Now, note that the reciprocal ratio of a:b is b:a.
Reciprocal ratio of 72:132 is 132:72.
Reciprocal ratio of 312:612 is 132:72

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