<PRE><B>Question 1053870</B>
let x equal the number of questions in the test.


she answered 4/5 * x.


she got all of them right except for 3.


this means she answered 4/5 * x - 3 correctly.


she got 4 marks for each correct answer and her total score was 68.


this means that (4/5 * x - 3) * 4 = 68


simplify to get 16/5 * x - 12 = 68.


add 12 go both sides of the equation to get 16/5 * x = 80


multiply both sides of the equation by 5/16 to get x = 80 * 5 / 16.


solve for x to get x = 25.


there were 25 questions on the test.


she answer 4/5 of them for a total of 20.


she got 3 wrong which means she got 17 right.


she gets 4 marks for every correct answer which means she got 4 * 17 = 68 total marks.


looks good to me.


solution is 25.


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