Answer:
2 minutes left
Explanation:
They have 2 minutes left because after calculating all the math they have used 18 minutes in total. I found this out because the problem wants you to mutiply 26 and 15. The add that to the product of 15 and 30. once that is added it is 840 seconds. But when you add 60 (representing 1 of the 4 minutes) four times you will get an answer of 1080 seconds which equals 18 minutes. Then because they need 20 minutes you would do 20-18 which equals 2 minutes left.