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gmat prep question

by yvonne12 » Mon May 28, 2007 3:04 pm
at a certain theatre, the cost of each adult's ticket is $5 and the cost of a child's ticket is $2. what is the average cost of all the adults and childrens tickets sold at the theatre yesterday?

1. yesterday the ratio of the number of childrens tickets sold at the theatre to the number of adult tickets sold at the theatre was 3:2

2. yesterday 80 adults ticketswere sold at the theatre

please explain why it is a
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Re: gmat prep question

by jayhawk2001 » Mon May 28, 2007 6:11 pm
yvonne12 wrote:at a certain theatre, the cost of each adult's ticket is $5 and the cost of a child's ticket is $2. what is the average cost of all the adults and childrens tickets sold at the theatre yesterday?

1. yesterday the ratio of the number of childrens tickets sold at the theatre to the number of adult tickets sold at the theatre was 3:2

2. yesterday 80 adults ticketswere sold at the theatre

please explain why it is a
x = num of adult tix
y = num of children tix

We are asked to find (5x + 2y) / (x+y)

1 - sufficient. y/x = 3/2. We can solve above eqn.
(5 + 2y/x) / (1 + y/x)

2 - insufficient.

Hence A
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