51 questions were correct
Solution:
Given that Justin got 85 % of the questions correct on his math exam
There were 60 questions
To find: number of correct questions
From given information,
85 % of the questions correct on his math exam which means, 85 % of total number of questions are correct
Therefore number of correct questions can be found by calculating 85 % of total questions which is 85 % of 60
number of correct questions = 85 % of 60

Thus 51 questions were correct