Solve the problem.There are 30 students in Ms. Roth's preschool class. All of of the students own either cats or dogs, and some have both cats and dogs. If 18 of the students own dogs and 22 own cats, how many own both cats and dogs?
A. 10
B. 12
C. 8
D. 20
Answer: A
Mathematics
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A. 
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