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What number must be added to each of the numbers 10, 18, 22, 38 to get the numbers which are in proportion ?

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DISHA PUBLICATION-RATIO,PROPORTION AND VARIATION-Test Yourself
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  14. If a/b=1/3,\ b/c=2,\ c/d=1/2,\ d/e=3 and e/f=1/4 , then what is the...

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