3.
If the compound ratio of 7:5 and 8:x is 84:60. Find x.
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Answer:
We have,
Compound ratio of 7:5 and 8:x=84:60
7×x:5×8=84:60
7x:40=84:60
Product of extremes = product of means
⇒7x×60=40×84
⇒
60
40×84
=7x
7x=56
x=8
Hence, this is the answer.
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