If the same number be added to the numbers
5, 11, 15 and 31, the resulting numbers are in
proportion. Find the number.
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5+x/11+x=15+x/31+x------------> (5+x)(31+x)=(11+x)(15+x)
155+5x+31x+x^2=165+11x+15x+x^2---------->10x=10--------> x=1.
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