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As the OA is not given, for me the answer will be E and this is how I got it. Please let me know if I am right or wrong.

Statement 1 --> Insufficient because b and c can take any single value.

Statement 2 --> Insufficient as again b and c can take any values.

Combining the two statements

a = 1.5x + b and b = x + c ------------------------------------(From Statement 2) a = 1.5b and b = 1.5c ----------------------------------------(From Statement 1)

Substituting 1 in 2

we get b = 3x and x = 0.5 c. again b and c can take any value and therefore my answer is E.

Re: +ve single digits [#permalink]
31 Jan 2012, 18:23

5

This post received KUDOS

Expert's post

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This post was BOOKMARKED

What is the three-digit number abc, given that a, b, and c are the positive single digits that make up the number?

(1) a = 1.5b and b = 1.5c --> a/b=3/2=9/6 and b/c=3/2=6/4 --> a/b/c=9/6/4 and as a, b, and c are the positive single digits, then a=9, b=6 and c=4 --> abc=964. Sufficient.

(2) a = 1.5x + b and b = x + c, where x represents a positive single digit --> multiple values are possible, for example: if x=2 then a=3+b and b=2+c --> abc can 631 (for c=1) be or 742 (for c=2). Not sufficient.

c=c b=1.5c , put value of b in given equation no.1 a=2.25c

n = 225c+25c+c = 241c .. we know c is an integer and in this case it can take four values from 1 to 4 .. for values greater than 4, "n" will become 5 digit number. now a=2.25c .. we know a is also an integer .. from the possible values of c we have i.e. 1,2,3,4 .. only 4 will make a an integer ..

hence, a = 2.25*4=9 b = 1.5*4=6 c = 4

n = 964

2) well, this one is easy just put values in 100a+10b+c .. you'll get 260x+110c .. too many possibilities _________________

Re: What is the three-digit number abc, given that a, b, and c [#permalink]
16 Oct 2013, 05:26

(1) a = 1.5b b = 1.5c a = 2.25c

a must equal an integer and the only way this is satisfied is if c = 4 (2.25 * 4 = 9)

b = 1.5c = 1.5(4) = 6 a = 1.5b = 1.5(6) = 9

all checks out and no other possibilities so (1) is sufficient.

(2) Too many possibilities. a = 1.5x + b and b = x + c a = 1.5x + x + c = 2.5x + c a = 2.5x + c --> many possible values for 'a' and 'c'. Not sufficient.

Re: What is the three-digit number abc, given that a, b, and c [#permalink]
28 Oct 2014, 07:01

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Re: What is the three-digit number abc, given that a, b, and c [#permalink]
06 Oct 2015, 13:15

Bunuel wrote:

What is the three-digit number abc, given that a, b, and c are the positive single digits that make up the number?

(1) a = 1.5b and b = 1.5c --> a/b=3/2=9/6 and b/c=3/2=6/4 --> a/b/c=9/6/4 and as a, b, and c are the positive single digits, then a=9, b=6 and c=4 --> abc=964. Sufficient.

(2) a = 1.5x + b and b = x + c, where x represents a positive single digit --> multiple values are possible, for example: if x=2 then a=3+b and b=2+c --> abc can 631 (for c=1) be or 742 (for c=2). Not sufficient.

Answer: A.

Here is another way to solve this question. Question Stem: abc with a, b, c are the positive single digits -> abc = 100a + 10b + c (1) a = 3b/2 b = 3c/2 => abc = 241c and a = 9c/4 -> c must be 4 to make a a positive single digit. => abc = 241 x 4 = 964 -> Sufficient. (2) a = 3x/2; b = x + c => abc = 260x + 111c. Many possible for x and c -> Not sufficient.

Answer: A

gmatclubot

Re: What is the three-digit number abc, given that a, b, and c
[#permalink]
06 Oct 2015, 13:15

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