Data Sufficiency Questions
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Data sufficiency questions are a good source for scoring marks in competitive entrances using very less time.The advantage is that you never has to find the exact answers.You have to find whether the given statements are enough to find out the answer to the question.
This needs a bit of practice,since we need to analyse the given statements,individually first and then combined form.Also the answer options will be tricky sometimes.But practice it and you can increase your score easily .Also in lot of exams like CAT,GMAT,XAT etc,Data Sufficiency appears in both Quantitative section and Data Interpretation section.So its very easy to clear the cut-off marks if you can convert 4-5 DS questions.Also DS is now appearing in Bank entrances also
Here are some examples of DS questions for competitive exams...

Data Sufficiency Questions
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Answer the following questions by marking the answer options a,b,c,d or e.
a.The question can be answered by statement 1 alone.
b.The question can be answered by statement 2 alone.
c.The question can be answered by either statement alone.
d.The question can be answered only by combining both statements together.
e.The question cannot be answered by given data.


Who types at a faster rate, Raju or Renju?
(1) The difference between their typing rates is 10 words per minute.
(2) Renju types at a constant rate of 80 words per minute.

What was Anil’s average (arithmetic mean) grade for all of his courses?
(1) His grade in social studies was 75, and his grade in science was 75.
(2) His grade in mathematics was 95.

If today the price of an item is $3,600, what was the price of the item exactly 2 years ago?
(1) The price of the item increased by 10 per-cent per year during this 2-year period.
(2) Today the price of the item is 1.21 times its price exactly 2 years ago.

If the Eden ground is rectangular, what is its width?
(1) The ratio of its length to its width is 7 to 2.
(2) The perimeter of the playground is 396 meters

What is the value of x –1?
(1) x + 1 =3
(2) x – 1 <> r – s?
(1) x > r and y < y =" 2," s =" 3," r =" 5," x =" 6." y =" 7" y =" 3"> 9
If x and y are consecutive odd integers, what is the sum of x and y?
(1) The product of x and y is negative.
(2) One of the integers is equal to –1.

What is the value of x?
(1) 3 + x + y = 14 and 2x + y = 15
(2) 3x + 2y = 12 + 2y

If John is exactly 4 years older than Anil, how old is Aby?
(1) Exactly 9 years ago Aby was 5 times as old as Anil was then.
(2) Anil is more than 9 years old.