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While Preparing for exams like private job, IT jobs , SBI/PO/IBPS Job, CAT , GMAT exam Data Sufficiency is a very important topic. You should have good amount of practice in this section for scoring good marks.
In this tutorial we have listed some of very important question. We recommends you to practice these questions well as data sufficiency is an important section in all exams.
The questions can be categorized into following types
Practice the minitests and study the explanations for the ones you get wrong. The explanations will make the method clearer.
Each test has ten questions and should take 12 minutes.
Remember that variables (x, y etc.) can be positive, negative, zero or fractions, unless the question states otherwise.
Example 1: How is A related to B?
B is the father of A.
D is the brother of A.
Now before hopping for the conclusion, I’ll point out a mistake that students tend to make in such questions is that they conclude about the relationship without knowing the sex of the person involved.
Now let’s check out the statement (1) says that B is the father of A. Is it enough to conclude how A is related to B? Now A can either be B’s son or daughter. So, to establish a relationship of A to B we need to learn whether A is male or female or indirect terms:
A is the brother/sister of X.
A is the father/mother of X.
A is an uncle/aunt of X.
Now using the suggested method above we can notice that the statement (1) is not sufficient to answer the question. Similarly, statement (2) cannot bring us to any conclusion about the relationship of A and B. Thus, the answer is we cannot get the answer from statements (1) and (2) together but still more data are needed.
Another Example 3: Among four friends K, L, M, and N, who’s the heaviest?
Statement (1) L is heavier than K but lighter than N.
Statement (2) M is lighter than L
Sol: To find out the answer to the above question we will form an inequality and using the information given in the statement (1) we get,
K < L < N
And, using the second statement we get,
M < L
Combining the inequalities, we get,
K < M < L < N, or M < K < L <N
Thus, in the either of the two N is the heaviest. Hence, the answer is C as we needed both the two statements to derive the answer to the question.
In each of the questions below consists of a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read both the statements and
Give answer
Question 1: In which year was Rahul born ?
Statements:
-Rahul at present is 25 years younger to his mother.
-Rahul’s brother, who was born in 1964, is 35 years younger to his mother.
A. I alone is sufficient while II alone is not sufficient
B. II alone is sufficient while I alone is not sufficient
C. Either I or II is sufficient
D. Neither I nor II is sufficient
E. Both I and II are sufficient
Question 2: What will be the total weight of 10 poles, each of the same weight ?
Statements:
One-fourth of the weight of each pole is 5 kg.
The total weight of three poles is 20 kilograms more than the total weight of two poles.
A. I alone is sufficient while II alone is not sufficient
B. II alone is sufficient while I alone is not sufficient
C. Either I or II is sufficient
D. Neither I nor II is sufficient
E. Both I and II are sufficient
Question 3: How many children does M have ?
Statements:
H is the only daughter of X who is wife of M.
K and J are brothers of M.
A. I alone is sufficient while II alone is not sufficient
B. II alone is sufficient while I alone is not sufficient
C. Either I or II is sufficient
D. Neither I nor II is sufficient
E. Both I and II are sufficient
Question 4 : The last Sunday of March, 2006 fell on which date ?
Statements:
The first Sunday of that month fell on 5th.
The last day of that month was Friday.
A. I alone is sufficient while II alone is not sufficient
B. II alone is sufficient while I alone is not sufficient
C. Either I or II is sufficient
D. Neither I nor II is sufficient
E. Both I and II are sufficient
Questions 6 : Among five friends who is the tallest ?
I. D is taller than A and C.
II. B is shorter than E but taller than D.
A) If the data in statement I alone are sufficient to answer the question
B) If the data in statement II alone are sufficient answer the question
C) If the data either in I or II alone are sufficient to answer the question;
D) If the data in both the statements tog