Question

a/b = 2/3
a+b/b = ?
.

Answer 1

a/b=2/3⇒3a=2b⇒a=2b/3
$\frac{\frac{2b}{3}+^{3)}b}{b}= \frac{\frac{2b+3b}{3}}{b}=\frac{5b}{3}*\frac{1}{b}\\ \\\frac{5b}{3b}= \bold{\frac53}$

Answer 2

a/b=2/3
(a+b)/b=proportii derivate=(2+3)/3=5/3
as simple as that!!!