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Santa estimates that 10% of the children in the world have been good t

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New post 14 Mar 2019, 09:59
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Santa estimates that 10% of the children in the world have been good this year but do not celebrate Christmas, and that 50% of the children who celebrate Christmas have been good this year. If 40% of the children in the world have been good, what percentage of children in the world are not good and do not celebrate Christmas?

a. 20 %

b. 30 %

c. 40 %

d. 60 %

e. 70 %

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Re: Santa estimates that 10% of the children in the world have been good t  [#permalink]

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New post 19 Mar 2019, 11:52
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AkshdeepS wrote:
Santa estimates that 10% of the children in the world have been good this year but do not celebrate Christmas, and that 50% of the children who celebrate Christmas have been good this year. If 40% of the children in the world have been good, what percentage of children in the world are not good and do not celebrate Christmas?

a. 20 %

b. 30 %

c. 40 %

d. 60 %

e. 70 %


_______________G______NG________Total

C:_____________30______30_________60

DC:____________10______30_________40

total:___________40______60________100

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Re: Santa estimates that 10% of the children in the world have been good t  [#permalink]

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New post 19 Mar 2019, 12:26
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Assume total children=100.
Good =40 (given in last sentence)
So NOT Good=60.

Good but NOT Celebrate Christmas = 10 (given in the first line )
So Good and celebrate= 40-10=30 which is 50% of who celebrated Christmas. thus, Number who celebrated Christmas= 60.

Now fill the gaps i.e.
Celebrated Christmas but NOT Good =30 &
NOT CELEBRATED CHRISTMAS & NOT GOOD= 30. (Option D).

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Re: Santa estimates that 10% of the children in the world have been good t   [#permalink] 19 Mar 2019, 12:26
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