Question
If the third proportion of 16 and 20 is “0.5k”, then
find the value of (k − 20) : (k + 10).Solution
Third proportion of two numbers ‘a’ and ‘b’ is (b 2 /a).
So, 0.5k = (20 2 /16) = 25
Or, 'k' = 50
Required value = (50 - 20) : (50 + 10) = 30 : 60 = 1 : 2
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