If a : b = 7 : 3, then find the value of \(\frac{a + b}{a - b}\) .

\(\frac{5}{2}\) \(\frac{4}{3}\) \(\frac{7}{2}\) \(\frac{5}{3}\)

\(\frac{5}{2}\)

a : b   =  7 : 3 \(\frac{a + b }{a - b}\)= \(\frac{7 + 3}{7 - 3}\)  = \(\frac{10}{4}\) =  \(\frac{5}{2}\)