Question
If the third proportion of 18 and 12 is "0.25m", then
find the value of (m − 10) : (m + 30).Solution
Third proportion of two numbers 'a' and 'b' is (b²/a). So, 0.25m = (12²/18) = 8. Or, 'm' = 32. Required value = (32 - 10) : (32 + 30) = 22 : 62 = 11 : 31.
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