pam scored 78 on a test that had 4 fill-in questions worth 7 points each and 24 muliple choice questions worth 3 points each. She had one fill-in question wrong. How many multiple-choice questions did pam get right?
let x = number of multiple questions she got right.
then we set up the equation and solve for x:
(4-1)*7 + 3x = 78
21 + 3x = 78
3x = 57
x = 19
hope this helps~ :)