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

Redeem

Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

★★★★★5.0559 reviews
GMATLiveTeach 7 seats left
Chris Peckover
NEXT LIVE COHORT

Oct 13 to Jan 7, 2027

with Chris Peckover

Schedule
Tue, Thu · 8:00 to 10:00 PM ET
Included
40 live hours + 6 months of GMAT OnDemand
  • Live instruction and real-time questions
  • Class recordings and assigned practice
View class & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
Live EA class + 6 months of EA OnDemand
  • Expert-led weekly online sessions
  • EA Masterclass access between classes
View EA class & enroll
Limited cohort · enrollment openTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

130-point score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

what percentage purchase exactly 2 of the products?

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Legendary Member
Posts: 621
Joined: Wed Apr 09, 2008 7:13 pmFollowed by: 4 members
Thanked: 33 times
by vittalgmat » Wed Dec 31, 2008 2:32 am
Foodmart customers regularly buy at least one of the following products: milk, chicken, or apples. 60% of shoppers buy milk, 50% buy chicken, and 35% buy apples. If 10% of the customers buy all 3 products, what percentage of Foodmart customers purchase exactly 2 of the above products?

A. 5%
B. 10%
C. 15%
D. 20%
E. 25%

I am looking for multiple ways to solve this.
The question asks for "exactly 2 of the proucts". If someone can generalize this to handle other cases like
"atleast 1", atleast 2 etc.. I would greatly appreciate.

Also a related question. What if the values were not percentages??
How will the approach change? etc.

Thanks in advance.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
Master | Next Rank: 500 Posts
Posts: 119
Joined: Sun Nov 30, 2008 2:47 am
Thanked: 11 times

by Zipper » Wed Dec 31, 2008 3:51 am
There is a formula about these kind of questions.

ALL = A + B + C - (any two) - 2 x (all three)

You can easily generalize from here.

If all values (including rephrasing the question in a fixed number not %) were numbers the formula won't change.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 2467
Joined: Thu Aug 28, 2008 6:14 pmFollowed by: 11 members
Thanked: 331 times

by cramya » Wed Dec 31, 2008 7:28 am
For 3 sets use this:



Total(# unique objects) = Grp 1+ Grp2+Grp3+None(Neither) - grp (1 and 2) - grp(2 and 3) - grp(3 and 4) -2 grp(1 and 2 and 3)

None =0 since everybody buys atleast 1 product

100 = 60 + 50 + 35 + 0 - grp (1 and 2) - grp(2 and 3) - grp(3 and 4) - 2(10)


grp (1 and 2) + grp(2 and 3) + grp(3 and 4) = 145 - 100 -20

= 25

If its was not percents u would be plugging in the regular numbers based on wahts given. Its not any different in terms of the formula .
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 621
Joined: Wed Apr 09, 2008 7:13 pmFollowed by: 4 members
Thanked: 33 times

by vittalgmat » Wed Dec 31, 2008 10:27 am
Thanks Cramya and Zipper for the excellent explanation.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1