Question

Dan takes a test worth 100 points. Each question is worth the same number of points. Dan misses 5 questions and scores 80 on the test. How many points is each question worth?

Answer 1

(x-5)/x * 100 = 80
(x-5) * 100 = 80x
100x - 500 = 80x
20x = 500
x =25 questions
(100 / 25) = 4 points per question

Answer 2

each question is worth 4 points because if he missed 5 questions and 5*4 is 20 and 20 minus 100 is 80