Question
If the third proportion of 45 and 60 is “0.5k”, then
find the value of (k − 20) : (k + 40).Solution
Third proportion of two numbers ‘a’ and ‘b’ is (b²/a).
So, 0.5k = (60²/45) = 80
Or, 'k' = 160
Required value = (160 - 20) : (160 + 40) = 140 : 200 = 7 : 10
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