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In a certain high school, how many seniors are enrolled in both AP cal

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In a certain high school, how many seniors are enrolled in both AP cal  [#permalink]

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New post 26 Mar 2018, 22:21
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In a certain high school, how many seniors are enrolled in both AP calculus and AP statistics?

(1) 45 seniors are enrolled in AP calculus.
(2) 60 seniors are enrolled in either AP calculus or AP statistics or both

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Re: In a certain high school, how many seniors are enrolled in both AP cal  [#permalink]

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New post 26 Mar 2018, 23:30
Bunuel wrote:
In a certain high school, how many seniors are enrolled in both AP calculus and AP statistics?

(1) 45 seniors are enrolled in AP calculus.
(2) 60 seniors are enrolled in either AP calculus or AP statistics or both


According to the sets formula for 2 overlapping sets A & B

A + B - both AB + none = Total.

Here we are to find "both AP calculus and AP statistics"

(1) AP calculus = 45. This does not tell us about AP statistics or overlap. Not suff
(2) 60 seniors are enrolled in either AP calculus or AP statistics or both...meaning total - none = 60
AP calc + AP stat - both = 60 .. Not suff as we dont know both AP calc & AP stat

(1) + (2) together : 45 + AP stat - both = 60 Not suff as we don't know how many are enrolled in AP stat.

Hence Option (E) is correct.

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Gladi :-D
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Re: In a certain high school, how many seniors are enrolled in both AP cal &nbs [#permalink] 26 Mar 2018, 23:30
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