Percentages

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kaf: Senior | Next Rank: 100 Posts; Posts: 53; Joined: Mon Feb 09, 2009 12:18 am; Thanked: 1 times

by kaf » Mon Jul 27, 2009 4:16 pm

Hi could you please help me out with this question

In a certain class the boys were reduced by 20% and the girls by 30%. After the reduction the total number of students in the class is 260. How many students were in the class before the reduction?

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Source: Beat The GMAT — Problem Solving | Mon Jul 27, 2009 4:16 pm

krisraam: Master | Next Rank: 500 Posts; Posts: 221; Joined: Wed Jan 21, 2009 10:33 amFollowed by: 1 member; Thanked: 12 times

by krisraam » Mon Jul 27, 2009 5:17 pm

Let the no of boys be x and girls be y

8x + 7y = 2600

x and y need to be an integer.

x = 150 and y = 200.

Thanks
Raama

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