Title | DATA SUFFICIENCY GMAT |
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Author | Navin I |
Pages | 5 |
File Size | 1.5 MB |
File Type | |
Total Downloads | 448 |
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DATA SUFFICIENCY Each &me you work a data sufficiency ques,on, read the ques%on carefully. Ask yourself, “What do I know?” and determine what addi3onal informa3on is required to answer the ques%on. If you think of the five answer choices as A, B, C, ...
DATA SUFFICIENCY Each &me you work a data sufficiency ques,on, read the ques%on carefully. Ask yourself, “What do I know?” and determine what addi3onal informa3on is required to answer the ques%on. If you think of the five answer choices as A, B, C, D and E, you can check on fact at a ;me to eliminate answers. Look at Fact (1) and narrow the answer choices to “AD” or “BCE” Try the following problems by first using Fact (1) to eliminate some answers. Then (and only then) look at Fact (2). 1. What is the value of x? (1) If x is subtracted from 60, the result is 20 (2) If x is divided by z, the result is 20 2. If x + y + z = 180, what is the value of x? (1) y = 75 (2) y + z = 141 !
3. If x and y are posi/ve integers and = 2, what is the value of x? !
(1) 1 < y < 5 (2) y is odd 4. If
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= z, what is the value of z?
(1) yz = 30 (2) y = 10 and z = 3 5. What is the value of x? (1) x + y = 20 (2) z -‐ 3x = 45
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Sufficient
Insufficient
Sufficient
Insufficient
Insufficient
Sufficient
Sufficient
Insufficient
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YES – NO DATA SUFFICIENCY You have already seen data sufficiency problems that ask about a value. In those problems, you must decide if the statements provide sufficient informa4on to let you solve for the value. Other data sufficiency problems ask ques%ons that require a “yes” or “no” answer. Even though the ques-ons are a li2le different, you’ll s-ll use the AD/BCE method to work these problems. Let’s try a few examples: 1. Does x = 10? (1) Ten percent of x = 1 (2) One-‐fi"h of x is an even prime number 2. Has brand X been purchased by more than 50 percent of the 5000 people in Goa? (1) Brand Y has been purchased by 75% of people in Goa (2) Brand X has been purchased by exactly 2200 people in Goa 3. Is x > 0? (1) x + y > 0 (2) y = 12
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Banging In on Yes-No Data Sufficiency When Yes-‐No data sufficiency ques0ons involve variables, Banging In can help you determine whether a statement is sufficient. Begin by plugging in a number that fits the statement and see whether you get a “yes” or “no” answer to the ques3on. Next, try to bang in a number that fits the statement but returns the opposite number. Using weird numbers on Yes-‐No data sufficiency ques0ons is a good idea. However, you must choose numbers that fit the statement you are considering.
For Yes-‐No data sufficiency ques+ons: • Determine what a “yes” answer means and what a “no” answer means before you consider the statements. • A statement is sufficient if it enables you to answer the ques6on with a definite “yes” OR a definite “no” • A statement is insufficient if you can answer the ques1on with a “yes” AND a “no” or if the statement does not provide enough informa2on to determine any answer. • When you bang in, you must choose numbers that fit the rules laid down by the statements.
4. Is x + 7 an odd integer? (1) 2x + 3 is an odd integer. (2) X + 11 is an even integer. 5. Is x a posi)ve number? (1) x + 6 > 2 (2) x2 > 25 6. If x is an integer such that 9 < x < 100, is x prime? (1) Both tens and units digit are prime (2) x + 6 = prime number
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