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
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
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.

715+ 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.

The charge for a telephone call between City R and City S

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Legendary Member
Posts: 2276
Joined: Sat Oct 14, 2017 6:10 amFollowed by: 3 members
by VJesus12 » Mon Mar 19, 2018 4:01 am
The charge for a telephone call between City R and City S is $0.42 for each of the first 3 minutes and $0.18 for each additional minute. A certain call between these two cities lasted for x minutes, where x is an integer. How many minutes long was the call?

(1) The charge for the first 3 minutes of the call was $0.36 less than the charge for the remainder of the call.

(2) The total charge for the call was $2.88.

The OA is D.

I liked this question but I couldn't solve it. May someone shows me how to solve it? Thanks in advanced.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
Legendary Member
Posts: 2898
Joined: Thu Sep 07, 2017 2:49 pmFollowed by: 5 members
Thanked: 6 times

answer

by Vincen » Mon Mar 19, 2018 6:30 am
VJesus12 wrote:The charge for a telephone call between City R and City S is $0.42 for each of the first 3 minutes and $0.18 for each additional minute. A certain call between these two cities lasted for x minutes, where x is an integer. How many minutes long was the call?

(1) The charge for the first 3 minutes of the call was $0.36 less than the charge for the remainder of the call.

(2) The total charge for the call was $2.88.

The OA is D.

I liked this question but I couldn't solve it. May someone shows me how to solve it? Thanks in advanced.
Let's write the things we know:
- $0.42 for each of the first 3 minutes.
- $0.18 for each additional minute.
- A Certain call lasted for x minutes, where x is an integer.

Now let's use each statement.

(1) The charge for the first 3 minutes of the call was $0.36 less than the charge for the remainder of the call.

We have that $$\left(First\ 3\ \text{minutes}\right)\cdot0.42\ =\left(Rest\ of\ the\ call\right)\cdot0.18-0.36$$ $$3\cdot0.42\ =\left(x-3\right)\cdot0.18-0.36\ \Rightarrow\ \ 1.26+0.36=\left(x-3\right)\cdot0.18\ \Rightarrow\ \ \frac{1.62}{0.18}=x-3$$ $$\Rightarrow\ x=9+3\ =12.$$ Since we got the value of x, this statement is SUFFICIENT.

(2) The total charge for the call was $2.88.

$$\left(First\ 3\ \text{minutes}\right)\cdot0.42\ +\left(Rest\ of\ the\ call\right)\cdot0.18=2.88$$ $$3\cdot0.42\ +\left(x-3\right)\cdot0.18=2.88\ \Rightarrow\ \ \left(x-3\right)\cdot0.18=2.88-1.26\ \Rightarrow\ x-3=\frac{1.62}{0.18}$$ $$\Rightarrow\ x=9+3\ =12.$$ Here we get the value of x, hence this statement is SUFFICIENT.

Hence, the answer is D.

I hope it helps you.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY

GMAT/MBA Expert

User avatar
Legendary Member
Posts: 503
Joined: Thu Jul 20, 2017 9:03 amFollowed by: 15 members
Thanked: 86 times
GMAT Score:770

Subject

by ErikaPrepScholar » Sat Mar 31, 2018 3:32 pm
The charge for a telephone call between City R and City S is $0.42 for each of the first 3 minutes and $0.18 for each additional minute. A certain call between these two cities lasted for x minutes, where x is an integer. How many minutes long was the call?

(1) The charge for the first 3 minutes of the call was $0.36 less than the charge for the remainder of the call.

(2) The total charge for the call was $2.88.

Quick note on this problem: we don't need to solve for exactly how long the call was. We only need to determine that we can solve it. We know that the first 3 minutes of the call cost $0.42 each, or $1.26 in total. We know that the remaining minutes of the call cost $0.18 apiece. This means that if we know the cost of the minutes in the call after 3 minutes, we can divide by $0.18 to get the number of minutes after 3 minutes. Then we can add 3 to get the total minutes in the call.

So if we can find the cost of the minutes in the call after 3 minutes, the statement will be sufficient.

Statement 1

This tells us that the charge for the minutes in the call after 3 minutes is $1.26 + $0.36 = $1.62. We could divide by $0.18 to get minutes after 3 and then add 3, but we don't need to - we know that we could. Sufficient.

Statement 2

This tells us that the charge for the minutes in the call after 3 minutes is $2.88 - $1.26 = $1.62. Again, we know we can solve. Sufficient.
Image

Erika John - Content Manager/Lead Instructor
https://gmat.prepscholar.com/gmat/s/

Get tutoring from me or another PrepScholar GMAT expert: https://gmat.prepscholar.com/gmat/s/tutoring/

Learn about our exclusive savings for BTG members (up to 25% off) and our 5 day free trial

Check out our PrepScholar GMAT YouTube channel, and read our expert guides on the PrepScholar GMAT blog
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1