2008
Mathematics
67ca00ce0c643c71d77dee1f
A book seller sells Mathematics and English books. If 30 customers buy Mathematics books, 20 customers buy English books and 10 customers buy the two books. How many customers has he altogether?
A.
30
B.
40
C.
50
D.
60
Correct Answer: 40
Explanation
n(M) only = 30-10 = 20 n(E) only = 20-10 = 10 n(M∩E) = 10 ∴M∪E = 20+10+10 = 40
n(M) only = 30-10 = 20 n(E) only = 20-10 = 10 n(M∩E) = 10 ∴M∪E = 20+10+10 = 40THIS WEEK's
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