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 →

kaplan question

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 53
Joined: Thu Apr 12, 2007 12:32 am
Thanked: 1 times
by jc114 » Mon May 07, 2007 7:20 am
A certain hotel has 1400 single rooms and 420 double rooms. Each room is cleaned by one person. If one person can clean a single room every 15 minutes and a double room every 20 minutes, how many cleaning persons are need to clean all the rooms if each person works for exactly 7 hours?
A. 65
B. 70
C. 80
D. 90
E. 265

If the sum of the first n positive integers is S, what is the sum of the first n positive even integers, in terms of S?
A. S/2
B. S
C. 2S
D. 2S+2
E. 4S
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
Master | Next Rank: 500 Posts
Posts: 105
Joined: Mon Sep 18, 2006 12:34 pm
Location: OH
Thanked: 7 times
GMAT Score:780

by mschling52 » Mon May 07, 2007 7:57 am
(1) B - 70

(1400 singles) x (1/4 hour per room) = 350 hours cleaning
(420 doubles) x (1/3 hour per room) = 140 hours cleaning

Total = 490 hours of cleaning

At 7 hours per person, this requires 70 people
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 559
Joined: Tue Mar 27, 2007 1:29 amFollowed by: 2 members
Thanked: 5 times

by Cybermusings » Mon May 07, 2007 10:48 am
A certain hotel has 1400 single rooms and 420 double rooms. Each room is cleaned by one person. If one person can clean a single room every 15 minutes and a double room every 20 minutes, how many cleaning persons are need to clean all the rooms if each person works for exactly 7 hours?
A. 65
B. 70
C. 80
D. 90
E. 265

1 person ---- single room 15 min --- double room 20 min
1400 single rooms require 1400*15 = 21000 minutes = 350 hrs
and 420 double rooms require 420*20 = 8400 minutes = 140 hrs
Total = 490 hrs
Total ppl required = 490/7 = 70

If the sum of the first n positive integers is S, what is the sum of the first n positive even integers, in terms of S?
A. S/2
B. S
C. 2S
D. 2S+2
E. 4S

first say 5 integers have sum = 1+2+3+4+5 = 15
First 5 even integers have sum of 2+4+6+8+10 = 30
Thus 2S should be the answer
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1