Barney ate 21 M&M's. If he ate 15% of the bag of M&M's, how many were in the bag to start?

3.15

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There were 140 M&M's in the bag to start.

Step-by-step explanation:

Note: The word "of" is a good indicator of multiplication in word problems.

Let's say x is the number of M&M's in the bag. Then,

21=x*15%

Solve for x by dividing by 15% on both sides

140=x

There were 140 M&M's in the bag to start.

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step-by-step explanation: