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Data Sufficiency Questions, Tips and Method

By: Ramandeep Singhon 8/24/2013 08:33:00 PM

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Data sufficiency is animportant part of quantitative aptitude section of every competitive exam

includingIBPS, LIC, Civil services, CAT and GMAT. In almost every exam there are severalquestions


from data sufficiency.

Most of the candidatestry to solve data sufficiency questions by guess work. As every questioncarries

same marks, questions in this part also deserve some time. Instead ofguess work use a simple strategy

as give below and avoid guessing theanswer.

Steps in solving Data Sufficiencyquestions

1) Read the givenproblem. Don't assume anything except universal facts.

2) Take the firststatement and combine it with main statement. Try to find the answer.

3) If you are unable tofind the answer using 2nd step then combine second statement and combine it

with main statement and try to find answer.

4) If you are unable tofind an answer using second statement then add both statements with main

statement and try to find answer

5) If even now you can'tfind answer, simply tick both statements are insufficient.

Directions :-

Marks A as answer ifstatement I alone is sufficient to answer the question


Marks B as answer ifstatement II alone is sufficient to answer the question

Marks C as answer ifstatement I and II together are sufficient to answer the question but neither

statementaloneis sufficient to answer the question

Data Sufficiency questions and answers

Question 1. How many people are there in the plain ?

Statement I : 25%passengers are women and 35% are children.

Statement II : There are24 men in the plain

Answer

From Statement I we canconclude that there are 40% men in the plain but we can't find the exact

numberof passengers

From Statement two : Number of men passengers = 24

By combining both thestatements we get, total number of passengers = 24 * 100/40 = ( you dont need

to calculate the answer )

Hence answer is C


Question 2. What is the difference between monthly income ofRam and Chaaru

Statement I : Ram earnsRs 6000 less than Shaam

Statement II : Chaaruearns Rs 6000 more than Shaam.

Answer : In this question we don't need to in depth.Simply there is difference of Rs 12000

Question 3. Is x divisible by 28 ?

Statement I : x isdivisible by 20

Statement II : x isdivisible by 84

Answer. Using statement I - x is divisible by 4 and 5

Using statement II - xis divisible by 3,4, and 7.

By using both statementswe can conclude that x is divisible by 28 ( 4*7), hence answer is C.

Question 4. P,Q,R,S and T are five friends. Their mean ageis 18. What is the age of R ?

Statement I : P's age is18

Statement II : Q's ageis 2 years less than T and T's age is 6 years less than S.

Statement III : R's ageis 6 years more than B's age and 4 years more than T's age.

Answer : P+Q+R+S+T = 90

From Statement I :Q+R+S+T = 72

From Statement II : Q =T - 2 and T=S - 6

So S = T + 6


Statement III : R = Q+6and R = T + 4

Age of every friend canbe defined in terms of T's age by using all three statements. So we canreach the

answer using all three statements. Hence answer is C.

Tips to solve Data Sufficiency questions

Never try to reachfinal answer as it is not asked. You need to find whether the information

provided is enough to solve the given problem or not.

Never make anyassumption. Use only universal rules { eg. a + b = a + b - (a U b) }

Try to solve questionsby using above strategies

Solve question stepby step. First try to find answer using first statement then second and

finallywith both. Then mark the answer

Even if you findanswer with only one statement, then try to find answer with remaining

statement as sometimes there is an option that answer can be find with bothstatements

separately.


Move on quickly andmark answer can't be found in case you are unable to reach any

conclusion withinformation provided.

Hope you like thearticle, in case of any query or revision in article, please comment below.

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Unknown 8 months ago

sir x is divisible by 84 then we conclude that 2nd statement is sufficient and ans is (ii) because 28 is a factor of 84

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Anonymous 8 months ago

ok

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Anonymous 8 months ago

Hi Sir, Nice information, its very useful to understand

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Ramandeep Singh a year ago

Watch my DS video on my Youtube channel

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saranya raj a year ago

Hello sir, I don't understand the data sufficiency question. Where are the options? Pls explain me sir.

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preeti a year ago

bro why its nt possible to copy paste ur documents,,,it is very time consuming 2 make notes each and every time

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Anonymous a year ago

Please guide me how to prepare for sbi p.o exams and also which book is best for self study

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SHERIN SHAJU 2 years ago

thanks for your plan........

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SHERIN SHAJU 2 years ago

iam so happy what u are provided... thanku

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Ramandeep Singh 2 years ago

Please try to solve some questions yourself

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Gourav kr jha 2 years ago

i am very weak in english paper and data sufficiency part so you solve these problem

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Gourav kr jha 2 years ago

i don't understand you provide the tips for data sufficiency.

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raman2572 2 years ago

What is the problem ?

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raman2572 2 years ago

Download revision notes here http://www.bankexamstoday.com/...

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