Question

If the third proportion of 16 and 20 is “0.5k”, then

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

find the value of (k − 20) : (k + 10).

A 1:2

B 2:3

C 3:4

D 5:6

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Solution