Maggie picked 40 apples. Kelsey picked 28 apples. Layla picked some apples, too. The three averaged 30 apples picked. How many did Layla pick?
Together, they picked 30*3=<<30*3=90>>90.
There are 40+28=<<40+28=68>>68 accounted for.
Then Layla picked 90-68=<<90-68=22>>22.
#### 22