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Question 7 Ratio and Proportion Exercise 7.2
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Answer:
Consider x be subtracted from each term
23 – x, 30 – x, 57 – x and 78 – x are proportional
It can be written as
23 – x: 30 – x :: 57 – x: 78 – x
(23 – x)/ (30 – x) = (57 – x)/ (78 – x)
By cross multiplication
(23 – x) (78 – x) = (30 – x) (57 – x)
By further calculation
\begin{array}{l} 1794-23 x-78 x+x^{2}=1710-30 x-57 x+x^{2} \\ x^{2}-101 x+1794-x^{2}+87 x-1710=0 \end{array}
So we get
-14x + 84 = 0
14x = 84
x = 84/14 = 6
Therefore, 6 is the number to be subtracted from each of the numbers.
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