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.

If knz≠0, what is the ratio of k to n? 1) The ratio of k

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Elite Legendary Member
Posts: 3991
Joined: Fri Jul 24, 2015 2:28 amFollowed by: 37 members
Location: Las Vegas, USA
Thanked: 19 times
by Max@Math Revolution » Mon Mar 28, 2016 4:00 am
If knz≠0, what is the ratio of k to n?

1) The ratio of k to z is 2 to 3
2) The ratio of z to n is 4 to 5


* A solution will be posted in two days.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 16207
Joined: Mon Dec 08, 2008 6:26 pmFollowed by: 1268 members
Location: Vancouver, BC
Thanked: 5254 times
GMAT Score:770

by Brent@GMATPrepNow » Mon Mar 28, 2016 10:43 am
If knz ≠ 0, what is the ratio of k to n?

1) The ratio of k to z is 2 to 3
2) The ratio of z to n is 4 to 5
Target question: What is the ratio of k to n?

Given: knz ≠ 0
This tells us that none of the variables equals zero.

Statement 1: The ratio of k to z is 2 to 3
There's no info about the value of n, so there's no way to find the ratio of k to n.
Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT

Statement 2: The ratio of z to n is 4 to 5
There's no info about the value of k, so there's no way to find the ratio of k to n.
Since we cannot answer the target question with certainty, statement 2 is NOT SUFFICIENT

Statements 1 and 2 combined
Statement 1 tells us that k : z = 2 : 3
Statement 2 tells us that z : n is 4 : 5

We can create equivalent ratios so that the z-value is the same for each ratio.

Rewrite statement 1 to get: k : z = 8 : 12
Rewrite statement 2 to get: z : n is 12 : 15

Combine to get: k : z : n = 8 : 12 : 15
So, the ratio k : n = 8 : 15

Since we can answer the target question with certainty, the combined statements are SUFFICIENT

Answer = C

For more on COMBINING RATIOS, see this free video: https://www.gmatprepnow.com/module/gmat ... video/1083

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
Image
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Elite Legendary Member
Posts: 3991
Joined: Fri Jul 24, 2015 2:28 amFollowed by: 37 members
Location: Las Vegas, USA
Thanked: 19 times

by Max@Math Revolution » Tue Mar 29, 2016 11:19 pm
Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.


If knz≠0, what is the ratio of k to n?

1) The ratio of k to z is 2 to 3
2) The ratio of z to n is 4 to 5


In the original condition, there are 3 variables(k,z,n), which should match with the number of equations. So you need 3 equations. For 1) 1 equation, for 2) 1 equation, which is likely to make E the answer.
When 1) & 2), multiply 4 to k:z=2:3 and 3 to z:n=4:5, which makes k:z=8:12 and z:n=12:15 respectively. Then, k:z:n=8:12:15 is derived and k:n=8:15, which is unique and sufficient.
Therefore, the answer is C.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Elite Legendary Member
Posts: 3991
Joined: Fri Jul 24, 2015 2:28 amFollowed by: 37 members
Location: Las Vegas, USA
Thanked: 19 times

by Max@Math Revolution » Tue Mar 29, 2016 11:22 pm
Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.


If knz≠0, what is the ratio of k to n?

1) The ratio of k to z is 2 to 3
2) The ratio of z to n is 4 to 5


In the original condition, there are 3 variables(k,z,n), which should match with the number of equations. So you need 3 equations. For 1) 1 equation, for 2) 1 equation, which is likely to make E the answer.
When 1) & 2), multiply 4 to k:z=2:3 and 3 to z:n=4:5, which makes k:z=8:12 and z:n=12:15 respectively. Then, k:z:n=8:12:15 is derived and k:n=8:15, which is unique and sufficient.
Therefore, the answer is C.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1