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Re: The student population of a certain school increased a% from [#permalink]
Expert Reply
End of the two decades the students are 180

The students at the beginning of the two decades are 120

remember that the increase is 3 times the second decade than the first decade. So the ration is 1:3

x+3x=80

4x=80

x=20

So to recap

first decade increase = 20. we do have 120 students

second decade is 3 times that. So we do have an increase of 60.

Total increase in TWO decades is 180

End value is 180
Starting value is 120

\(\frac{180-120}{120}=50%\)

The answer is C
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Re: The student population of a certain school increased a% from [#permalink]
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More on % increase or decrese in the new math handout

https://gre.myprepclub.com/forum/gre-ma ... tml#p81625

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Re: The student population of a certain school increased a% from [#permalink]
Hello from the GRE Prep Club BumpBot!

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