Step-by-step explanation:

<em>hOpE</em><em> </em><em>iT</em><em> </em><em>hElPs</em><em> YoU</em>
<h3><em><u>I</u></em><em><u> </u></em><em><u>nEEd</u></em><em><u> bRainLIeST</u></em></h3>
Let bob score =x
according to given condition
(3x-40)/2=100
3x-40=200
3x=240
x=80
so bob score =80
Answer:
8.5 bags are needed.
Step-by-step explanation:
Given : Number of bags needed 

To Find : how many bags he needs?
Solution :



Now we are given that Number of bags needed 
Substitute the value of x


Hence 8.5 bags are needed.
Answer:
x = 16
Step-by-step explanation:
9/12 = 12/x
9x = 144
x = 16