Question

the compound ratio at 3:4 and 5:7

Answer 1

your ans

for finding compound ratio first let's consider two ratios like

a:b and c:d

so there compound ratio will be (a:c):(b:d)

similarly

(3:4) and (5:7)

their compound ratio will be

(3:5):(4:7)

Answer 2

here is your answer it may help u

compound ratio is nothing but the products.
so,compound ratio of 4:5&3:5is given by:
4/5*3/5=12/25
hence it's wrong
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