Marcos had 20 minutes to do a three-problem quiz. He spent 11 minutes on question A and 5

minutes on question B. How much time did he have left for question C?

4 minutes

Step-by-step explanation:

11 minutes on the first so we have 11, 5 minutes on the second so we add 11 and 5, then we get 16, so we are 16 minutes into the quiz, subtract the 16 from our total time of 20 and we get 4

Answer: he had 4 minutes