Answer:
9
Explanation:
First you multiply 1.6 by b and 3.5.
1.6b+5.6=20
Then you move everything besides b over to one side and change the sign.
1.6b=20-5.6
Next you subtract 20 by 5.6.
20-5.6=14.4
Finally you divide 1.6 by both sides.
b=14.4/1.6
b=9
