A bag of M&M's contains 6 yellow m&m's, 5 orange m&m's, 4 green m&m's, 7 blue m&m's, and the rest are red. If 20% of the bag are yellow, how many red m&m's are
in the bag?

8

Step-by-step explanation:

First we find out how many m&m's in total there are in the bag.

If 6(yellow) is equal to 20% and 20% is equal to 1/5 we just need to multiply    6 by 5 to get the total in bag.

6 x 5 = 30

Now we know the total in bag, so we just add all the numbers we know together 6 + 5 + 4 + 7 = 22

If there are 30 in total and there are 22 other colors the answer is

30 - 22 = 8

a = 11 : 4

b = 38

c = 1 for every 6