,4
设只参加数学队的人为a,只参加学术队的人为b,两样都参加的人为c,那么a+c=9,b+c=10,a+b=11,a=5,b=6,c=4,所以两队都参加的人数为4
there are 9 students on the math team and 10 students SAT
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