BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

If a, b are positive integers (b≠1), is a/b<1/10 ?

This topic has 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 am
Location: Las Vegas, USA
Thanked: 19 times
Followed by:37 members

If a, b are positive integers (b≠1), is a/b<1/10 ?

by Max@Math Revolution » Mon Jul 18, 2016 8:30 am
If a, b are positive integers (b≠1), is a/b<1/10 ?
1) a/(b-1)<1/15
2) (a-1)/b<1/15

*An answer will be posted in 2 days
Top
Source: — Data Sufficiency |
Newbie | Next Rank: 10 Posts
Posts: 4
Joined: Fri Jul 15, 2016 11:29 am

by rocker2112 » Tue Jul 19, 2016 11:59 pm
Statement 1 -

a/b-1 < 1/15 ---> 15a + 1 < b since and b are positive --- > sufficient to say that 10a < b - SUFFICIENT

Statement 2 -

a-1/b < 1/15 ---> 15a - 15 < b. Put a = 2 and a= 5 and you will see that you get 2 answers for the original expression -- NOT SUFFICIENT
Top
User avatar
Elite Legendary Member
Posts: 3991
Joined: Fri Jul 24, 2015 2:28 am
Location: Las Vegas, USA
Thanked: 19 times
Followed by:37 members

by Max@Math Revolution » Mon Jul 25, 2016 4:50 am
Since there are 2 variables in the original condition, there is a high chance that C is the correct answer. Applying the common mistake type 4(A), the correct answer is A.

- 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.
Top
Post new topic Post Reply
• Page 1 of 1