contestada

If a certain number is added to both the numerator and denominator of the fraction 5/7, the result is 3/5
Find the
number.

Respuesta :

Answer:

Let the number be x:

then

[tex](5+x)/(7+x)=3/5\\5(5+x)=3(7+x)\\25+5x=21+3x\\5x-3x=21-25\\2x=-4\\x=-2[/tex]

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