asked Aug 6, 2016 in Algebra 2 Answers by anonymous

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Let N be the number: (7+N)/(12+N)=3/4; 4(7+N)=3(12+N); 28+4N=36+3N; N=36-28=8.

CHECK: 15/20=3*5/(4*5)=3/4 OK.
answered Aug 6, 2016 by Rod Top Rated User (417,100 points)
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