Four times the number of problems Martha answered is 4 x 2 = <<4*2=8>>8.
So, Jenna answered 8 - 2 = <<8-2=6>>6 problems.
The number of problems Mark answered is 6 / 2 = <<6/2=3>>3.
The total number of problems Martha, Jenna, and Mark answered is 2 + 6 + 3 = <<2+6+3=11>>11.
So, this means Angela was able to answer 20 - 11 = <<20-11=9>>9 problems.
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