Black to brown ratio

In a box, there are 20 pairs of socks, of which 65% are black and the rest are brown. What's the ratio of black and brown socks?

Correct answer:

r =  13:7

Step-by-step explanation:

n=20 q=65%=10065=2013=0.65  a=q n=0.65 20=13 b=na=2013=7  r=a/b=13/7=713=1761.8571=13:7

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