of the 400pupils in a school,
70have readmagazinesA B C
100have read A B
80have read A C
90have read B C
150 have read A
170 have read B
160 have READ C
how many pupils have read at least one of magazines?
Maths Pastpaper 1979 - Set
2009-04-17 6:25 am
回答 (1)
2009-04-17 7:04 am
✔ 最佳答案
Starting at ABC = 70then AB = 100 - 70 = 30
AC = 80 - 70 = 10
BC = 90 - 70 = 20
A = 150 - 70 - 30 - 10 = 40
B = 170 - 70 - 30 - 20 = 50
C = 160 - 70 - 20 - 10 = 60
So there are 70 + 30 + 10 + 20 + 40 + 50 + 60 =
280 pupils have read at least one of magazines.
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