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700 level question

by shekar123 » Sat May 29, 2010 8:47 pm
The town of Sandwich has a total of 5,400 citizens. Of these, 1/4 are over the age of 60. If an advertising campaign attracts a number of new residents over 60 equal to 1/5 of the town's current 60+ citizens and there are no other changes in the population, approximately what percent of Sandwich's total population would be over the age of 60?

A)28.6

B)25

C)23.8

D)21

E)20
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by student22 » Sat May 29, 2010 8:55 pm
The way I solved it: 5400 * 1/4 = 1350.

Next add a number equal to 1/5 of 1350, so (1/5) * 1350 = 270

Next its asking what's the percentage of people over 65 to the total population: (1350 + 270)/(5400 + 270) = 28.6. A.

Let me know if I'm right.
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by gmatmachoman » Sat May 29, 2010 8:57 pm
Yeah you are correct!!
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by devp » Sat May 29, 2010 10:28 pm
Earlier it was 25% and we added a few more, so the only option is 28.6 % therefore A.
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