20% of her 40 students will bring their own life vest so .20*40 = <<.20*40=8>>8 students will bring their life vests
Alice has 20 life vests and 8 students will bring there's so that's 20+8 = <<20+8=28>>28 life vests
There are 40 students and 10 instructors total so that's 40+10 = <<40+10=50>>50 people in the class
If there are 28 life vests and she has 50 people then she needs to find 50-28 = 22 more life vests
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