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 %
Answer: B
Source: Manhattan GMAT
Santa estimates that 10% of the children in the world have been good this year but do not celebrate Christmas, and that
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