Answer:
4
Step-by-step explanation:
There are two basic ways to solve this problem.
(1) There are 2 cups of milk chocolate chips for every 3 cups of total chips. The total amount of chips added is 6, which is twice the amount that the ratio adds up to. So we double the amount of milk chocolate chips used in the ratio.
(2) For every 3 cups of total chocolate chips, there are 2 cups milk chocolate chips. Two is 2/3 of three, which means all you have to do is find 2/3 of 6 (the total amount of chocolate chips added). 2/3 of six is 4.