Answer: I would say 5 days.
Step-by-step explanation:
I added both days together and divided by 2 because there are two individuals working on 20 trees and divided equally it would be 10 and it would take 5 days because that’s half.
For landing on heads the fraction is 1/2 which is 50%
Think lower than 21 I know the answer btw if you needit
D and F are not equivalent to ax+bx+ac+bc+