Answer:
together they rake
leaves in one minute.
Step-by-step explanation:
If Maya takes x minutes to rake, then in one minute, she rakes
leaves.
For Carla, if her raking takes y minutes, in one minute she rakes
leaves.
Thus, to find the amount they work together in one minute, we add both of their contributions for that minute, resulting in: 
Finally, simplifying this expression gives:

As a result, they collectively rake
leaves in a minute.
77%
I prefer using ratios and cross multiplication for scenarios like this. Divide the part (1001) by the whole (1300), and set that equal to x percent of 100 percent.
1001/1300 = x/100
100100 = 1300x
x = 77