Those 16 problems cost him 34%
One problem is worth 34/16 = 2.0625
So each question is worth about 2 point.
2*x = 66 Divide by 2
x = 66 /2 = 33 questions that he got right.
The total number of questions is 33 + 16 = 49
Does the rounding really matter?
2.0625 x = 66
x = 66/2.0625
x = 32 yes it matters.
Total number of questions = 32 + 16 = 48 <<<< answer.