BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Kaplan GMAT Math Workbook question

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Junior | Next Rank: 30 Posts
Posts: 11
Joined: Mon Jan 07, 2008 6:31 pm
Thanked: 1 times

Kaplan GMAT Math Workbook question

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
Top
Source: — Problem Solving |
User avatar
GMAT Instructor
Posts: 3225
Joined: Tue Jan 08, 2008 2:40 pm
Location: Toronto
Thanked: 1710 times
Followed by:614 members
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
Image

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
Top
Post new topic Post Reply
• Page 1 of 1