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What must be subtracted from each term of 5 : 7, so that it is equal to 3 : 4?

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Let y be subtracted from each term. Given that (5x - y)/(7x - y)=3/4 Upon Cross-multiplication we get 20x-4y=21x - 3y y= -x Hence -x must be subtracted from each term to get the ratio of 3:4.
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Solution to Maths

We should subtract (-1) from each term of 5:7 so that it is equal to 3:4. Solution would be : Let 'x' be the term which is to be subtracted from each term of 5:7 ratio. Now, equate the ratio such that: (5-x)/(7-x) = 3/4 , therefore x= -1.
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(-1) must be subtracted.
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Please check this out Prantosh.
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(5-x)/ (7-x) = (3/4) => 4(5-x)= 3(7-x) => (20-4x) = (21-3x) => -4x+3x=21-20 => -x= 1=> x = -1
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Let that no. Is x. Now , (5-x/7-x)= 3/4 On solving, x = -1
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