a school has 63 students studying A,B and C. 33 study A, 25 study B, 26 study C. 10 study A and B, 9 study B and C while 8 study both A and C. Equal num study all three subjects as those who learn none of the three. How many study all 3 subjects?

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Question

a school has 63 students studying A,B and C. 33 study A, 25 study B, 26 study C. 10 study A and B, 9 study B and C while 8 study both A and C. Equal num study all three subjects as those who learn none of the three. How many study all 3 subjects?

#help me solve this question#

anonymous · Answer

|dw:1356287630536:dw|

a+b+d+e = 33
b+e+f+c = 25
d+e+f+g = 26

b+e = 10
f+e = 9
d+e = 8 

e = 63 - (a+b+c+d) 

Solve for e..