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counting and probability junior
Problem
Last summer students attended basketball camp. Of those attending, were boys and were girls. Also, students were from Jonas Middle School and were from Clay Middle School. Twenty of the girls were from Jonas Middle School. How many of the boys were from Clay Middle School?
(A)
(B)
(C)
(D)
Solution
Make a table with the information given. Because the first two columns must add up to the third column, and the same with the rows, the rest of the empty boxes can be filled in. The number of boys from Clay is .
Final answer
B