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 →

Rate and Work

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 328
Joined: Thu Aug 07, 2008 5:25 pm
Location: Philadelphia
Thanked: 4 times
GMAT Score:550
by Abdulla » Fri Dec 12, 2008 4:39 pm
Machine A and Machine B are each used to manufacture 660 sprockets. It takes machine A 10 hours longer to produce 660 sprockets than machine B. Machine B produces 10 percent more sprockets per hour than machine A. How many sprockets per hour does machine A produce?

(A) 6
(B) 6.6
(C) 60
(D) 100
(E) 110

OA is A
Abdulla
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
User avatar
Master | Next Rank: 500 Posts
Posts: 248
Joined: Mon Aug 11, 2008 9:51 am
Thanked: 13 times

by earth@work » Fri Dec 12, 2008 6:06 pm
let A: x+10 hrs.....1 work = 1 hr........1/(x+10)work
B: x hrs................1 work= 1 hr........1/(x)work
now we r given a relation: B=10%A+A
1/(x)=10%(1/(x+10))+1/(x+10)
x=100
A:1hr.......1/110 work
660 sprocket: 660/110=6
Ans: A
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 154
Joined: Tue Aug 26, 2008 12:59 pm
Location: Canada
Thanked: 4 times

by canuckclint » Fri Dec 12, 2008 7:16 pm
My explanation:


*** A ***
work = 660
hours = b + 10
rate = a

work = rate * time
(1) 660 = (b+10)a

*** B ***
work = 660
hours = b
rate = 1.1a

work = rate * time
(2) 660 = 1.1ab

*** solve eqs 1 & 2 for a ***
(1) 660 = (b+10)a
(2) 660 = 1.1ab

(b+10)a = 1.1ab (div both sides by a, I can't solve a at this point so far)
b + 10 = 1.1b
b = 100

Recall *** A and do work/time***
work = 660
hours = b + 10
rate = a

660/110 = 6
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1