I m not sure of my answer but i think its correct...
7 cones/ 3 cups of ice cream.
The nearest multiple of 3 to 220 is 219
one cone per cup = 7/3 ( 7 cones for 3 cups )
Total no of cups sold = 219* One cone per cup
= 219* 7/3
= 511 cones
Therefore, the number of cones the store would sell is 511 cones.