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Let the total people at 9AM = 100x. Then Daily : Campers = 85x:15x
At noon, Daily = 85x+8500 and Campers = 15x
We are given the ratio of D:C at noon = 97.5:2.5 or 39:1
So we can make the equation as
(85x + 8500)/15x = 39/1
85x + 8500 = 585x
500x = 8500 or x=17
Hence daily campers = 15x = 15*17 = 255
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Let the population be 100A
Campers = 15A
By noon, camper = 2.5%
(100A + 8500)*2.5/100 = 15A
(A + 85)*2.5 = 15A
12.5A=85*2.5
A=17
Campers = 15A = 15 * 17
=255
Ans C
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15% = 3/20
2.5% = 1/40 =3/120

....... Campers..........total
9:00 .... 3x.............. 20x
12:00.... 3x........... 120x



Difference 100x = 8,500
Find 3x = 3(85) =255


kevincan
On Stanley Beach there are campers and day visitors. One day, no campers arrived on or left Stanley Beach. At 9:00 a.m., 85% of the people on the beach were day visitors. By noon, that figure had risen to 97.5%. If there were 8,500 more people on the beach at noon than at 9:00 a.m., how many campers were on the beach?

(A) 225
(B) 240
(C) 255
(D) 300
(E) 340

First full day of summer for most of us !
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