Use proportions.
2 chocolate chips : 6 peanuts = ? chocolate chips : 108 peanuts
Find the scale factor of the information that matches. In this case it would be 108 peanuts divided by 6 peanuts. Then use this scale factor to multiply 2 chocolate chips by to get your answer.
SF: 108 ÷ 6 = 18
18 x 2 = 36 chocolate chips
2 chocolate chips : 6 peanuts = 36 chocolate chips : 108 peanuts
ANSWER: If there are 108 peanuts in the mix, there will be 36 chocolate chips in the mix.