b) 6
Step-by-step explanation:
12/8=1.5
9x1.5=6
A=6
12÷8= 1.5
9÷A=1.5
A=9÷1.5
a=24; b=12
step-by-step explanation:
a/b=2: 1
a=2b
36/(1+2)=12
b=12
a=24