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

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

help needeeeeed!!! ( sets )

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 61
Joined: Mon Feb 14, 2011 11:39 pm
by marmar29 » Tue Feb 15, 2011 12:15 am
in a school ,Ss must take at least one of these subjects : math, chem,or physics
in a group of 50 Ss, 7 take ol the 3 subjects , 9 take ph & ch only , 8 tk math & ph pnly , 5 tk math n ch only .of these 50 ss, x take math only , x take physics only ,x+3 take ch only . draw a venn diagram , find x & find the number taking math ????
pls i need it in brief way n the rule tht u used

PS ..is ths for extended IG or A -LEVEL ...THANNKS
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
User avatar
Junior | Next Rank: 30 Posts
Posts: 27
Joined: Thu Oct 21, 2010 8:40 am

by vaflaly » Tue Feb 15, 2011 1:29 am
total= only(math) + only(phys)+ only(chem)+ both(math&phys)+both(chem&phys)+both(math&chem)+ all3

only(math)= x
only(phys) = x
only(chem)= x+3

total(math&phys)= only(math) + only(phys) - both(math&phys)
both(math&phys)= 2x-8
In the same way, both(math&chem)=2x-2
both(chem&phys)=2x-6

remember all3 is number of students learning the 3 subject s

50= x + x + x+3 + 2x-8 + 2x-2 + 2x-6 + 7

x=7


Drawing a wenn diagram is good to have a clear view
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 423
Joined: Fri Jun 11, 2010 7:59 amFollowed by: 2 members
Location: Seattle, WA
Thanked: 86 times

by srcc25anu » Tue Feb 15, 2011 1:52 pm
total (50) = only M(x) + only Phy (x) + only Chem (x+3) +M &Phy only (8) + M&Chem only (5) + phy and Chem only (9) + all three (7)
x=6
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 61
Joined: Mon Feb 14, 2011 11:39 pm

by marmar29 » Tue Feb 15, 2011 8:36 pm
thanks for yr active replay but if we sub. 7 in the equation the final result wont be 50 !!
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 61
Joined: Mon Feb 14, 2011 11:39 pm

by marmar29 » Tue Feb 15, 2011 8:38 pm
hi srrc, thanks alooot for yr active response
its very weasy n straight forward ...it really helps !
have a good day
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1