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One-fifth of the students at a nursery school are 4 years

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VP
Joined: 25 Nov 2004
Posts: 1435
One-fifth of the students at a nursery school are 4 years  [#permalink]

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18 Apr 2005, 23:12
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One-fifth of the students at a nursery school are 4 years old or older. If 16 students have not yet reached their third birthday, and a total of 40 students are not between 3 years old and 4 years old, how many children are in the nursery school?

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VP
Joined: 30 Sep 2004
Posts: 1439
Location: Germany

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19 Apr 2005, 00:20
1
120 students

40 students are not between 3 and 4 years. 16 students are under 3 years and so 24 are over 4 years. 24 is 1/5 of the total number of students. so 24 times 5 is 120.
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Senior Manager
Joined: 19 Feb 2005
Posts: 471
Location: Milan Italy

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19 Apr 2005, 03:49
got the same result with the same reasoning
120
mmmm...where's the trick?
Current Student
Joined: 28 Dec 2004
Posts: 3255
Location: New York City
Schools: Wharton'11 HBS'12

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19 Apr 2005, 11:35
120 for me too...
here is how i did it...

let X be number of students.

1/5 (X) > 4yrs

16< 3yrs

40 <>3 and 4 yrs.

in other words 1/5(x)+16=40!

solve for X and we get 120.
Non-Human User
Joined: 09 Sep 2013
Posts: 8535
Re: One-fifth of the students at a nursery school are 4 years  [#permalink]

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03 Dec 2017, 03:59
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This discussion does not meet community quality standards. It has been retired.

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Re: One-fifth of the students at a nursery school are 4 years &nbs [#permalink] 03 Dec 2017, 03:59
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