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2 QUestions on Problem solveing

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by bluefalcon_7691 » Wed Jun 18, 2008 6:58 am
QUestions I was not able to solve.Please find time to solve and respond:
1: For every positive integer n h(n) is product of all even interegrs 2 to n inclusive.If P is the smallest prime factor of h(100)+1 , then p lies between:
Options are:
A: Between 2 and 10
B:Between 10 and 20
C:Between 20 and 30
D:Between 30 and 40
E: greater than 40

2:Alice's take home pay last year was the same each month and she saved the same fraction of her take home pay each month.The total amount of money that she had saved at the end of the year was 3 times the amount of that portion of her monthly take home pay that she did not save. If all the money that she saved last year was from her take home pay, what fraction of her take home pay did save each month.

Answer options:
A 1/2
B 1/3
C 1/4
D 1/5
E 1/6
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by durgesh79 » Wed Jun 18, 2008 7:28 am
For Q 1, please search the forums, you'll find recent posts.

For Q2 : here is what i think.

let x is the fration alice saved everymonth
means she spent 1-x everymonth

Now as per question stem :
Amount of money she saved in a year = 12*x
3 times the monthly money she did not save = 3*(1-x)

12*x = 3*(1-x)
9x=3
x=1/3

Answer B
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by gabriel » Wed Jun 18, 2008 7:37 am
Like I told on the other thread, start a separate thread (one question per thread) for each question.
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by beeparoo » Sat Jun 21, 2008 9:51 am
durgesh79 wrote:12*x = 3*(1-x)
9x=3
x=1/3

Answer B
Durgesh, while I think your concept was correct, you did not execute the arithmetic properly.

Second line should read: 15x=3. That gives you an answer of x = 1/5, which is D.

P.S. I make mistakes like this all the time. It's one of those, "Ugh" moments, for me.
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by beeparoo » Sat Jun 21, 2008 10:22 am
durgesh79 wrote:12*x = 3*(1-x)
9x=3
x=1/3

Answer B
Durgesh, while I think your concept was correct, you did not execute the arithmetic properly.

Second line should read: 15x=3. That gives you an answer of x = 1/5, which is D.

P.S. I make mistakes like this all the time. It's one of those, "Ugh" moments, for me.
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by durgesh79 » Sat Jun 21, 2008 10:31 am
beeparoo wrote:
durgesh79 wrote:12*x = 3*(1-x)
9x=3
x=1/3

Answer B
Durgesh, while I think your concept was correct, you did not execute the arithmetic properly.

Second line should read: 15x=3. That gives you an answer of x = 1/5, which is D.

P.S. I make mistakes like this all the time. It's one of those, "Ugh" moments, for me.
:oops: Thanks Beeparoo.....

UGHHHHHHHH........ :evil: with myself. i do atleast 3 of such mistakes in a practice test........
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