3 + x/2 = 7
x = (7-3)*2 = 8 = the number
20 total
6 have average of 5 years
6 x 5 = 30
20-6 = 14
14 have average of 8 years
14 x 8 = 112
112 + 30 = 142
142 / 20 = 7.1 years
Answer:
I believe it is distributive because you are finding the products. Yes, the numbers are mixed up but the parenthesis often involve distributive property.
Step-by-step explanation:
Add all the number then divided by as many numbers as you added
