Answers

2014-08-06T19:40:08+08:00
Let x be the number
then, 
 \frac{7+x}{13+x} = \frac{5}{8}  \\8(7+x)=5(13+x) \\ 3x=9  \\   x=3

the original fraction is  \frac{10}{16}
0
2014-08-06T19:48:01+08:00