Question

John mows 40% in 20 minutes, How much more time does he need?

Answer 1

30 more mins.because 40 percent in 20 mins=80 percent in 40 mins
and the 20 percent left is the same thing as 40/2 so then you also have to do 20mins/2=10

Answer 2

8 mins because 40 percent of 20 equals 8
So the answer is 8 minutes