Answer: 50 Is the correct answer Step-by-step explanation: Because 4/5 = 0.8 an if you divide 50 by 0.8. 50/0.8 = 40. And he finished , and 40 questions in math 3 in science. So he has a total of 50 questions in math. Also cause I took the test and got it right. It said this was correct.
