The compound ratio of 5 : 7 and inverse 2 : 9 is
The compound ratio of 5 : 7 and inverse 2 : 9 is
A) 45 : 14
B) 10 : 63
C) 63 : 10
D) 14 : 45
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Correct option is (A) 45 : 14
Inverse ratio of 2 : 9 is 9 : 2.
\(\therefore\) The compound ratio of 5 : 7 and inverse 2 : 9 is equal to the compound ratio of 5 : 7 and 9 : 2.
\(=\frac57\times\frac92=\frac{45}{14}\)
Thus, the compound ratio of 5 : 7 and inverse 2 : 9 is 45 : 14.
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