Each digit in the two-digit number G is halved to form a new : GMAT Problem Solving (PS)
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# Each digit in the two-digit number G is halved to form a new

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VP
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Each digit in the two-digit number G is halved to form a new [#permalink]

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08 Aug 2006, 12:49
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56% (02:43) correct 44% (01:15) wrong based on 717 sessions

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Each digit in the two-digit number G is halved to form a new two-digit number H. Which of the following could be the sum of G and H?

A. 153
B. 150
C. 137
D. 129
E. 89
[Reveal] Spoiler: OA

Last edited by Bunuel on 13 Aug 2013, 23:40, edited 1 time in total.
Edited the question and added the OA.
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08 Aug 2006, 13:02
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D it is...

The way to do it is to try and break the units digit into numbers that satisfy the criterion that it should be the sum of a number and its double... i.e. x + 2x...

A satisfies, as 3 = 1 + 2, but 15 cannot be broken into such a form.
The next choice that satisfies is D; 9 = 3 + 6. Also, 12 can be written as (8+4)... Hence D
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Uh uh. I know what you're thinking. "Is the answer A, B, C, D or E?" Well to tell you the truth in all this excitement I kinda lost track myself. But you've gotta ask yourself one question: "Do I feel lucky?" Well, do ya, punk?

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08 Aug 2006, 13:12
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D 129

Given G =10x+y
H= 10 (x/2) + y/2

G+H = 3/2(10x+y) = 3/2G

G < 100 => G+H < 150

A & B are ruled out

(G+H)x2/3 = G an integer.

Only D is an integer.

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08 Aug 2006, 13:14
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Can you enlighten me why not E? what am I missing?

46 and 23 is 89
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Re: PS: sum of 2 digit numbers [#permalink]

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08 Aug 2006, 13:16
divide each answer choice by 3, the result must be 2 digit number and cannot be greater than 44. also the unit digit of the resulting 2 digit number cannot be greater than 4.

A. 153/3 = 51. no good.
B 150/3 = 50. again not.
C 137/3 = fraction doesnot work.
D 129/3 = 43. it works but let wait for E.
E 89/3 = fraction. same as C.

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Re: PS: sum of 2 digit numbers [#permalink]

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08 Aug 2006, 13:21
Professor wrote:
divide each answer choice by 3, the result must be 2 digit number and cannot be greater than 44. also the unit digit of the resulting 2 digit number cannot be greater than 4.

I am sorry... probably a dumb but please bear with me so, why are we diving these by 3?
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08 Aug 2006, 13:21
u2lover wrote:
Can you enlighten me why not E? what am I missing?

46 and 23 is 89

69, not 89
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Uh uh. I know what you're thinking. "Is the answer A, B, C, D or E?" Well to tell you the truth in all this excitement I kinda lost track myself. But you've gotta ask yourself one question: "Do I feel lucky?" Well, do ya, punk?

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08 Aug 2006, 13:22
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D

That means H is half of G.
So G+ H = 3H.
This means sum of G and H must be divisible by 3.
C and E are out.

Lets see other choices

A - 153 then H = 51, G = 102 G is a two gidit number
B - 150 then H = 50, G = 100 G is a two gidit number
D - 129 then H = 43, G = 86 ANSWER
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08 Aug 2006, 13:24
u2lover wrote:
Can you enlighten me why not E? what am I missing?

46 and 23 is 89

69, not 89

talking about feeling stupid on some days... can't stop laughing now... I need lunch no carbs
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08 Aug 2006, 13:27
Eat some fruits...

u2lover wrote:
I need lunch no carbs
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Re: PS: sum of 2 digit numbers [#permalink]

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08 Aug 2006, 14:09
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u2lover wrote:
Professor wrote:
divide each answer choice by 3, the result must be 2 digit number and cannot be greater than 44. also the unit digit of the resulting 2 digit number cannot be greater than 4.

I am sorry... probably a dumb but please bear with me so, why are we diving these by 3?

probably you got it by the time you read this post.

the question says that H is half of G and G is divisible by 2. if so G = 2H
their sum = G + H = 2H + H = 3H

so it should be divisible by 3.
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08 Aug 2006, 14:17
haas_mba07 wrote:
Eat some fruits...

u2lover wrote:
I need lunch no carbs

yup, take some fruit. i just finished 3 bowls cuz i had to divide every answer choice by 3.
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08 Aug 2006, 14:45
If H has digits x and y, G has digits 2x and 2y.
So G+H =30x+3y and x and y are less than 5

G+H must be a multiple of 3, and units digit must be one of {3,6,9,2}

Unless units digit is 2, number formed by hundreds and tens digits must be a multiple of 3.

Only D fits the bill
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08 Aug 2006, 19:50
I got it in 30 seconds by picking numbers
I started out around 80 as the answer choices are about the 120-130 mark..
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10 Aug 2006, 08:14
I remember a trick from last year, someone from kaplan had told me..whenever u see the "which of the following" type question..start with answer choices in the bottom, i.e d and e..

ok, so lets see

i picked answer choice D ...129..hmm...

sum=2X+x....so lets 129=3x, does it divide by 3 yes...x=43....i will keep the answer choice..i check 89..does it divide by 3..NO..so I am done...129 is my answer...
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10 Aug 2006, 09:23
As a Kaplan instructor, I can tell you that that advice is not helpful. The correct answer is just as likely to be A as E. You should quickly look at all of the answers to see which is the easiest to evaluate/most promising.
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11 Aug 2006, 01:27
D

let the tens digit be x and units digit be y

Hence first number = 10x + y
Second number = 5x + y/2

Sum = 15x + 3y/2

Substitute values for x and y
15*8 + 3*6/2 = 129
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Re: Each digit in the two-digit number G is halved to form a new [#permalink]

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13 Aug 2013, 09:18
let the number be x, now x is halved => x/2..the question asks what is x?

x(number) + x/2 (half of that number) = something

=> 3x/2 = something
=> x = 2 (something) / 3

so the answer choice must be divisible by 3

eliminate C, E right away

check the rest

D satisfies

3x/ 2 = 129

=> x = 86

Verify. 86 + 43 = 129

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Re: Each digit in the two-digit number G is halved to form a new [#permalink]

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13 Aug 2013, 12:18
u2lover wrote:
Each digit in the two-digit number G is halved to form a new two-digit number H. Which of the following could be the sum of G and H?

A 153
B 150
C 137
D 129
E 89

use this flow chart
Attachments

two digit.png [ 33.34 KiB | Viewed 9041 times ]

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Re: Each digit in the two-digit number G is halved to form a new [#permalink]

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13 Aug 2013, 23:50
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u2lover wrote:
Each digit in the two-digit number G is halved to form a new two-digit number H. Which of the following could be the sum of G and H?

A. 153
B. 150
C. 137
D. 129
E. 89

Two-step solution:

G + G/2 = 3G/2 --> the sum is a multiple of 3.

G is a two-digit number --> G < 100 --> 3G/2 < 150.

Among the answer choices the only multiple of 3 which is less than 150 is 129.

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Re: Each digit in the two-digit number G is halved to form a new   [#permalink] 13 Aug 2013, 23:50

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