Question

bill can answer 41 math questions every 20 minutes how many math questions can he answer in 40 minutes and 80 minutes

Answer 1

20 minutes × 2 = 40 minutes
41 questions × 2 = 82 questions

40 minutes × 2 = 80 minutes
82 questions × 2 = 164 questions

Answer 2

For 40 minutes he can answer 82 math questions.
For 80 minutes he can answer 123 math questions.