Kaplan GMAT Math Workbook question

Expert replies

keerthivivek: Junior | Next Rank: 30 Posts; Posts: 11; Joined: Mon Jan 07, 2008 6:31 pm; Thanked: 1 times

by keerthivivek » Sun Mar 09, 2008 3:39 pm

A vending machine dispenses gumballs in a regularly repeating cycle of ten different colors. If a quarter buys 3 gumballs, what is the minimum amount of money that must be spent before three gumballs of the same color are dispensed ?

a. $1
b. $1.75
c $2
d. $2.25
e. $2.5

Pls explain why the answer choice, as given in Kaplan Workbook, is b

Like this post

Source: Beat The GMAT — Problem Solving | Sun Mar 09, 2008 3:39 pm

Stuart@KaplanGMAT: GMAT Instructor; Posts: 3225; Joined: Tue Jan 08, 2008 2:40 pmFollowed by: 614 members; Location: Toronto; Thanked: 1710 times; GMAT Score:800

Re: Kaplan GMAT Math Workbook question

by Stuart@KaplanGMAT » Sun Mar 09, 2008 4:03 pm

keerthivivek wrote:A vending machine dispenses gumballs in a regularly repeating cycle of ten different colors. If a quarter buys 3 gumballs, what is the minimum amount of money that must be spent before three gumballs of the same color are dispensed ?

a. $1
b. $1.75
c $2
d. $2.25
e. $2.5

Pls explain why the answer choice, as given in Kaplan Workbook, is b

To guarantee 3 gumballs of the same colour, we need 21 gumballs (since that will give us 2 cycles of 10 + 1 triple colour).

It's 3 gumballs for every 25 cents, so 21/3 means we need to make 7 purchases.

7 * 25 cents = $1.75

Stuart Kovinsky | Kaplan GMAT Faculty | Toronto

Kaplan Exclusive: The Official Test Day Experience | Ready to Take a Free Practice Test? | Kaplan/Beat the GMAT Member Discount
BTG100 for $100 off a full course

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

560 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review