If 11 students offer Biology, 13 students offer Maths, 14 students offer Agric, 9 students offer Maths and Biology, 3 students offer Maths and Agric, 7 students offer Maths, Biology and Agric. How many students offer Biology and Agric?
Let the total number of students be "S" and the numbers of student offering Biology and Maths be "x" .
"S=n(B)+n(M)+n(A)+n(B\\bigcap M)+n(B \\bigcap A)+n(M\\bigcap A)+n(B\\bigcap M\\bigcap A)\\\\\nS=11+13+14+x+9+3+7\\\\\nS=57+x\\\\\nx=S-57"
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