posted by emanuel .
on the test had 50 items gertrude got 34 out of the first 40 correct. if she received a grade of 80% on the test how many of the last 10 did she have correct
80% of 50 questions is 40 questions.
She got 34 right out of the 1st 40, so she had to get 6 more right in the last 10.