Question

What has to be added to the sum of 5/7 and 7/5 to get 3? Give the awnser as either a whole number or fraction- no decimal awnsers

Answer 1

Let

x ----> the number

we have that

$\frac{5}{7}+\frac{7}{5}+x=3$

Solve for x

$x=3-(\frac{5}{7}+\frac{7}{5})$$\begin{gathered} x=3-(\frac{5*5+7*7}{35}) \\ x=3-(\frac{74}{35}) \end{gathered}$$\begin{gathered} x=(\frac{35*3-74}{35}) \\ \\ x=\frac{31}{35} \end{gathered}$

therefore

The number is 31/35