Question

2+1= 1+1= 3 1+2=
3 5 2 3 2 3

Answer 1

2+1 = 3
1+1 = 2
1+2 = 3

Answer 2

$\frac{2}{3}+ \frac{1}{5} = \frac{13}{15}$

$\frac{1}{2} + \frac{1}{3} = \frac{5}{6}$

$\frac{7}{2}+ \frac{2}{3} = \frac{25}{5} =5$