Maths problem

There is an event at Auckland Zoo. There were 92 visitors.
Out of these visitors, 20 were women and 22 were children.
How many were men?

92-20=

92-20=72

72-0=72

72-22=

72-20=52

52-2=50                            answer 50

Kiri has 87 apples. She gives away 38 apples to her friend
Daena. How many apples has she got left with her now?

87-38=

87-30=57

57-8=50         answer  50