change into the phone

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sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Thu May 07, 2009 4:33 am

To make a long distance call from a certain pay phone, you must deposit $1.75 for the first three minutes, and fifteen cents for each additional minute thereafter. What is the maximum number of minutes you can use the phone, if you deposit $5.00 worth of change into the phone?
A. 18
B. 21
C. 24
D. 25
E. 33

OA C

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Source: Beat The GMAT — Problem Solving | Thu May 07, 2009 4:33 am

Vemuri: Legendary Member; Posts: 682; Joined: Fri Jan 16, 2009 2:40 amFollowed by: 1 member; Thanked: 32 times

Re: change into the phone

by Vemuri » Thu May 07, 2009 4:42 am

3 mins - $1.75
1 min thereon - $0.15

1.75 + x(0.15) = 5 ==> x(0.15) = 3.25 ==> x = 21 mins

So, totally we need 21mins + 3mins = 24mins

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