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 →

If 18 is 15 percent of 30 percent of a certain number, what is the number?

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Moderator
Posts: 2558
Joined: Sun Oct 15, 2017 1:50 pmFollowed by: 6 members
by BTGmoderatorLU » Thu Aug 27, 2020 2:53 pm

Timer

00:00

Answers

A

B

C

D

E

Stats

Difficulty—

Source: GMAT Paper Tests

If 18 is 15 percent of 30 percent of a certain number, what is the number?

A. 9
B. 36
C. 40
D. 81
E. 400

The OA is E
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
Junior | Next Rank: 30 Posts
Posts: 11
Joined: Wed Aug 26, 2020 9:45 am

Re: If 18 is 15 percent of 30 percent of a certain number, what is the number?

by dg1900 » Fri Aug 28, 2020 1:16 am
Let X be the number we want

We are given 18 is 15% of 30% of the number we want.
We can write an equation using this in the form:
$$\frac{15}{100}\cdot\frac{30}{100}\cdot X=18$$
$$\frac{450}{10000}\cdot X=18$$
$$\frac{45}{1000}\cdot X=18$$
$$\frac{9}{200}\cdot X=18$$
$$\frac{1}{200}\cdot X=2$$
Therefore,
$$X=400$$
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 8155
Joined: Sat Apr 25, 2015 10:56 amFollowed by: 29 members
Location: Los Angeles, CA
Thanked: 43 times

Re: If 18 is 15 percent of 30 percent of a certain number, what is the number?

by Scott@TargetTestPrep » Mon Aug 31, 2020 10:36 am
BTGmoderatorLU wrote: ↑
Thu Aug 27, 2020 2:53 pm
 Source: GMAT Paper Tests

If 18 is 15 percent of 30 percent of a certain number, what is the number?

A. 9
B. 36
C. 40
D. 81
E. 400

The OA is E
Solution:

Letting x = the certain number, we can create the equation:

18 = 0.15 * 0.3 * x

18 = 0.045x

18000 = 45x

x = 18000/45 = 400

Answer: E

Scott Woodbury-Stewart
Founder and CEO
[email protected]

Image

See why Target Test Prep is rated 5 out of 5 stars on BEAT the GMAT. Read our reviews

ImageImage
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1