She has completed about 35% of the deliveries needed.
So you have to take the 21 and divide it by 60 to find x Which will be a .35, then multiply .35 by 100 to get 35%
Total number of deliveries Maya needs to make=60
Number of deliveries that are complete so far=21
Percentage= [tex] \frac{21}{60} *100 [/tex]
=[tex] \frac{7}{20} *100 [/tex]
=7*5
Percentage=35%