Can you solve this number puzzle?

Question

Answer 1

A+B=20
A-B=10

2A=30
A=30/2=15
If A is 15 then B is 5
A/B=15/5=03
The answer is 3

Answer 2

A + B = 20
A - B =10
Hence, 2A=30, A=15
A+B=20, B=20-A=5
A/B=3