a) A/(1/2)a =b
b) b = 24
Explanation:
a) Since everything is being multiplied on the right side you can just divide 1/2a to the other side that will leave b on the other side alone which is what you want
b) Just plug in the give numbers in the equation in part a) then do keep-change-flip then simplify then you should get 24 as the final answer.