Angie score 91 points on a test mom i received a 65% grade on the test how many points are possible on the test

I am guessing that the 91 points are the 65%. I do not completely understand the question but this is my best analysis. So from my perception of the question is that the 91 points are equal 65%.  This equation is just saying: 
91 = 0.65x 
So all you have to do is divide each side by 0.65: 
x=140. 
 The number of points possible on the test is 140. Have a splendid day. ;)

(here is the process I did)

91=0.65x
Step 1: Flip the equation.
0.65x=91

Step 2: Divide both sides by 0.65.
0.65x/0.65 = 91/0.65x = 140

 x = 140