Mrs Baldian has 42 cats, and Mrs. Malark have 20.67 cats (weird xD ), so they both have 62.67 cats in total (42+20.67=62.67). In addition, there's 40.57 cats in the shelter, so that makes it 103.24 cats (62.67+40.57=103.24). Then, 22 cats died: So at last, there's 81.24 cats left out in the shelter (103.24 - 22 = 81.24)
Hope this helps ;D