Data Sufficiency

Data Sufficiency

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Question 1
Question: In which year was Rahul born ? Statements: I. Rahul at present is 25 years younger to his mother. II. 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
Both I and II are sufficient
Question 1 Explanation: 
From both I and II, we find that Rahul is (35 - 25) = 10 years older than his brother, who was born in 1964. So, Rahul was born in 1954.
Question 2
Question: What will be the total weight of 10 poles, each of the same weight ? Statements: I. One-fourth of the weight of each pole is 5 kg. II. 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
Question 2 Explanation: 
From I, we conclude that weight of each pole = (4x5) kg = 20 kg. So, total weight of 10 poles = (20 x 10) kg = 200 kg. From II, we conclude that: Weight of each pole = (weight of 3 poles) - (weight of 2 poles) = 20 kg. So, total weight of 10 pojes = (20 x 10) kg = 200 kg.
Question 3
Question: How many children does M have ? Statements: I.H is the only daughter of X who is wife of M. II. 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
Question 3 Explanation: 
From I, we conclude that H is the only daughter of M. But this does not indicate that M has no son. The information given in II is immaterial.
Question 4
Question: How much was the total sale of the company ? Statements: I. The company sold 8000 units of product A each costing Rs. 25. II. This company has no other product line.
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
Both I and II are sufficient
Question 4 Explanation: 
From I, total sale of product A = Rs. (8000 x 25) = Rs. 200000. From II, we know that the company deals only in product A. This implies that sale of product A is the total sale of the company, which is Rs. 200000.
Question 5
Question: The last Sunday of March, 2006 fell on which date ? Statements: I. The first Sunday of that month fell on 5th. II. 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
Both I and II are sufficient
Question 5 Explanation: 
From I, we conclude that 5th, 12th, 19th and 26th of March, 2006 were Sundays. So, the last Sunday fell on 26th. From II, we conclude that 31st March, 2006 was Friday. Thus, 26th March, 2006 was the last Sunday of the month.
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