Answer :
Answer:6.9
Step-by-step explanation:
a is inversely proportional to b can be written as
a α 1/b
a=k/b k=constant
When a=12 b=20
12=k/20
Cross multiply
12 x 20=k
240=k
k=240
The relationship between a and b would be a=240/b
When a is 35
35=240/b
Cross multiply
35 x b=240
35b=240
Divide both sides by 35
35b/35=240/35
b=6.9