I just need help thank you thank you so much

refer to this attachment

kamsahamnida have a great day

a=24; b=12

step-by-step explanation:

a/b=2: 1

a=2b

36/(1+2)=12

b=12

a=24

1) 2/5

2) zero=0/1

3) zero=0/2

4) -4/5

5) undefined=3/0