Final answer:
To calculate total recess time, multiply the 40 minutes they finished early by 40% to find the extra recess time (16 minutes), and add it to the guaranteed 30 minutes for a total of 46 minutes.
Step-by-step explanation:
The question asks how much total recess time the class gets on a day when they finish their work 40 minutes early. The class starts with a guaranteed 30 minutes of recess, and they get an additional 40% of the time they finished early. To calculate the extra time, multiply 40 minutes by 40% (0.40) to find the additional recess time.
40 minutes * 0.40 = 16 minutes of extra recess.
Now, add the guaranteed recess to the extra recess time:
30 minutes + 16 minutes = 46 minutes of total recess.