Autumn was constantly misplacing her pencils.  At the start of the school year, she purchased a pack of 20 pencils.  In the first month of school, she misplaced 7 pencils, broke 3 pencils and had to throw them away, she found 4, and bought 2.  How many pencils did Autumn have left?
Autumn misplaced 7 and broke 3, so that lost her 7+3 = <<7+3=10>>10 pencils
Autumn found 4 pencils and bought 2, so she gained 4+2 = <<4+2=6>>6 pencils
She started with 20 pencils, lost 10 and gained 6 so she had 20-10+6 = <<20-10+6=16>>16 pencils left
#### 16