Answer :
64 divided by 16 is 4
now you have to add 3 bags of sugar to the 4 cups
3 times 4 is 12
she will use 12 cups of sugar for 64 tea bags
now you have to add 3 bags of sugar to the 4 cups
3 times 4 is 12
she will use 12 cups of sugar for 64 tea bags