Question

What percent is 40 minutes of 1 hour

Answer 1

40/60= 0.67 (i.e. 2/3)= about 66.67%

Answer 2

1 hour = 60 minutes
60 minutes - 40 minutes = 20 minutes
20 minutes is 1/3 of 60 minutes
1/3 = 33.3%
3/3 (1 hour) - 1/3 (20 minutes) = 2/3 (40 minutes)
2/3 = 33.3% x 2 
33.3% x 2 = 66.6%
The answer is 66.6%