Asked by Bell
In a survey of 63 people, 23 people subscribe to magazine A, 21people subscribed to magazine B,and 17 people subscribed to magazine C. For any two of the magazines,4 people subscribed to both magazines but not to the third magazine. If 5 people in the survey did not subscibe to any of the three magazines,how many people subscribed to all three magazines?
My sister told me the answer is 9 but I still don't know how to do it. Thanks
My sister told me the answer is 9 but I still don't know how to do it. Thanks
Answers
Answered by
Bell
BTW, the choices are
a)9
b)7
c)5
d)2
e)It cannot be determined from the info given.
a)9
b)7
c)5
d)2
e)It cannot be determined from the info given.
Answered by
Reiny
best done with Venn diagram
draw 3 intersecting circles, place x in the intersection of all three since we are not given that number
look at the intersection of any two circles.
We already have x in the middle, so place 4 in each of the remaining region of the pairs
now go to each of the whole circles
in A we already have accounted for 8+x, so the open part of A is 23-8-x or 15-x
in the same way the open part of B is 13-x
and the open part of C is 9-x
now add them all up
15-x + 13-x + 9-x + 12 + x + 5 = 63
-2x = -9
x = 4.5
not possible, unless I made an arithmetic error,
there is something wrong with your data
draw 3 intersecting circles, place x in the intersection of all three since we are not given that number
look at the intersection of any two circles.
We already have x in the middle, so place 4 in each of the remaining region of the pairs
now go to each of the whole circles
in A we already have accounted for 8+x, so the open part of A is 23-8-x or 15-x
in the same way the open part of B is 13-x
and the open part of C is 9-x
now add them all up
15-x + 13-x + 9-x + 12 + x + 5 = 63
-2x = -9
x = 4.5
not possible, unless I made an arithmetic error,
there is something wrong with your data
Answered by
Bell
What do you mean by the open part. Thanks
Answered by
Reiny
the part of the circle not covered by any part of the other two.
Answered by
Bell
And shouldn't the answer be x=-4.5; I think you had make a mistake, but thanks
Answered by
Simba
it should be 36 people in the survey not 63. I believe there was a typing error on this question.
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