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Class 10 > Learn Mathematics > What must be subtracted from each term of 5 : 7, so...
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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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Maths Tutor

(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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diploma in computer engineering

(5-x)/(7-x)=3/4 cross multiply ans = -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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Math Magician

For any term in ratio 5:7, 1. For 5/7 subtract (-1) from each term, 2. For 10/14 subtract (-2) from each term 3. For 15/21 subtract (-3) from each term and so on...answer will be 3:4
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Maths Teacher

it will be like suppose x is the no then (5-x)/(7-x) = 3/4. By solving we got x = -1. Hence, 1 should be added to get the answer.
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An Experienced Trainer

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Let x be subtracted from each term of 5:7 From given condition, (5-x)/(7-x)=3/4 cross multiplying we get 20-4x=21-3x x=-1. Therefore -1 needs to be subtracted from each term to get 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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