First find the additional number of claims John can handle: 30% * 20 claims = <<30*.01*20=6>>6 claims
Then add that amount to Jan's number of claims to find John's number of claims: 20 claims + 6 claims = <<20+6=26>>26 claims
Then add the 15 additional claims Missy can handle to find her number: 26 claims + 15 claims = <<15+26=41>>41 claims
#### 41