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# Wanna Kill "silly mistakes"? - part 1

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Manager
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Wanna Kill "silly mistakes"? - part 1 [#permalink]

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06 Apr 2008, 20:37
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Hi, Quantitative is not my problem 'cause I am major in Mathematics. HOWEVER, I have never got 100% correct

I know that my weakness is "to make silly mistakes", I did not recognize these mistakes until I saw the OA and then asked myself how could I come to this wrong answer? T_T Most of them are very simple questions T_T

Therefore, I will post some of my "most silly mistakes".
My purposes are (1): to remind myself of these stupid questions, (2): to test your carefulness in doing GMAT

Wanna try? 4 questions. You have 1 minute 30 seconds to solve each. No more. They are not difficult so save time for the other brutal ones.

1. Sue’s monthly earnings consist of a monthly salary and a 4 percent commission on the
portion of her monthly sales that is in excess of $2,000. If Sue’s monthly salary was the same in July as in August, how much greater were her sales in July than in August? (1) Sue’s monthly earnings were$3,620 in July and $3,580 in August. (2) Sue’s monthly salary was$3,500 in July and in August.
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is
sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

2. In isosceles triangle PQR, if the measure of angle P is 80º, which of the following could
be the measure of angle R?
I. 20º
II. 50º
III. 80º
A. I only
B. III only
C. I and II only
D. II and III only
E. I, II, and III

3. If x and z are integers, is at least one of them even?
(1) x + z is odd.
(2) x - z is odd.

4. What is the value of the integer n?
(1) n(n + 2) = 15
(2) (n + 2)n = 125

Easy huh? Watch your time and hope you get all of them right ^_^
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Re: Wanna Kill "silly mistakes"? - part 1 [#permalink]

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06 Apr 2008, 22:19
notahug wrote:
1. Sue’s monthly earnings consist of a monthly salary and a 4 percent commission on the portion of her monthly sales that is in excess of $2,000. If Sue’s monthly salary was the same in July as in August, how much greater were her sales in July than in August? (1) Sue’s monthly earnings were$3,620 in July and $3,580 in August. (2) Sue’s monthly salary was$3,500 in July and in August.

2. In isosceles triangle PQR, if the measure of angle P is 80º, which of the following could be the measure of angle R?

I. 20º
II. 50º
III. 80º

A. I only
B. III only
C. I and II only
D. II and III only
E. I, II, and III

3. If x and z are integers, is at least one of them even?
(1) x + z is odd.
(2) x - z is odd.

4. What is the value of the integer n?
(1) n(n + 2) = 15
(2) (n + 2)n = 125

1. a
2. e
3. d
4. b

normally i do math question in less than 30 seconds. some complex ones in 1-2 minuets. even more complexes in more than 2 minuets.

i do not solve most of the DS questions.
A is more time consuming and could not do in 1:30 minuets. took almost 2 minuets..
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CEO
Joined: 17 Nov 2007
Posts: 3586
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
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Re: Wanna Kill "silly mistakes"? - part 1 [#permalink]

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07 Apr 2008, 02:22
C,E,D,E (I do not understand the last question)
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Re: Wanna Kill "silly mistakes"? - part 1 [#permalink]

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07 Apr 2008, 06:55
C E D E

1) we need both because we need to find out her sales, we are only given her salary and earnings. Subtract to get sales.

2) Two angles have to be equal, one is 80. 80 80 20, 50 50 80, 80 20 80

3) D, just basic rules

4) E first statement gives you -5 and 3 second statement gives me something I could not factor? so I figured E.

All under 1:30 cept last one
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Re: Wanna Kill "silly mistakes"? - part 1 [#permalink]

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07 Apr 2008, 10:19
1. Sue’s monthly earnings consist of a monthly salary and a 4 percent commission on the
portion of her monthly sales that is in excess of $2,000. If Sue’s monthly salary was the same in July as in August, how much greater were her sales in July than in August? (1) Sue’s monthly earnings were$3,620 in July and $3,580 in August. (2) Sue’s monthly salary was$3,500 in July and in August.
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is
sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

1. C. Without knowing that in each month she sold at least 2000 dollars worth, it is not possible to find what the difference is.

2. In isosceles triangle PQR, if the measure of angle P is 80º, which of the following could
be the measure of angle R?
I. 20º
II. 50º
III. 80º
A. I only
B. III only
C. I and II only
D. II and III only
E. I, II, and III

E. All of these are possible

3. If x and z are integers, is at least one of them even?
(1) x + z is odd.
(2) x - z is odd.

D. Each alone is sufficient

4. What is the value of the integer n?
(1) n(n + 2) = 15
(2) (n + 2)n = 125

I would say A since from 1 we can find n = 3. The second eqn does not have integer roots.
Manager
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Re: Wanna Kill "silly mistakes"? - part 1 [#permalink]

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07 Apr 2008, 11:03
GMAT TIGER wrote:
notahug wrote:
1. Sue’s monthly earnings consist of a monthly salary and a 4 percent commission on the portion of her monthly sales that is in excess of $2,000. If Sue’s monthly salary was the same in July as in August, how much greater were her sales in July than in August? (1) Sue’s monthly earnings were$3,620 in July and $3,580 in August. (2) Sue’s monthly salary was$3,500 in July and in August.

2. In isosceles triangle PQR, if the measure of angle P is 80º, which of the following could be the measure of angle R?

I. 20º
II. 50º
III. 80º

A. I only
B. III only
C. I and II only
D. II and III only
E. I, II, and III

3. If x and z are integers, is at least one of them even?
(1) x + z is odd.
(2) x - z is odd.

4. What is the value of the integer n?
(1) n(n + 2) = 15
(2) (n + 2)n = 125

1. a
2. e
3. d
4. b

normally i do math question in less than 30 seconds. some complex ones in 1-2 minuets. even more complexes in more than 2 minuets.

i do not solve most of the DS questions.
A is more time consuming and could not do in 1:30 minuets. took almost 2 minuets..

Sorry. the 4th question is:
n is an interger
(1) n(n + 2) = 15
(2) (n + 2)^n = 125

GMAT TIger got them all correct ^_^ OA: A E D B

Yes I usually spend about 30second each. That's the reason why I finish Quantitative 5-7 minutes ealier but never got 100% correct. My strategy is: Be careful at the first second, keep that attitude until you finish the question. Check it again -->Spend at least 45-1 minute for each easy question.

You all see, not all of us have 100% correct answers, although no one said they are brutal ones !
Now do them again and you will see why you get wrong..
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Re: Wanna Kill "silly mistakes"? - part 1 [#permalink]

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07 Apr 2008, 11:21
Answer to first question cannot be A.
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Re: Wanna Kill "silly mistakes"? - part 1 [#permalink]

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07 Apr 2008, 11:53
pandeyrav wrote:
Answer to first question cannot be A.

Think about it. If Sue's earning is $3580 in August, and she has no sale number in August, then you can find the difference in sales of July and August based on that. If she earn base salary of$3500, then the number would be different.

Agree with Pandy.
I got C, E, D
and yet to do the last question. Didn't see the new post.

Last edited by bkk145 on 07 Apr 2008, 11:56, edited 1 time in total.
Manager
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Re: Wanna Kill "silly mistakes"? - part 1 [#permalink]

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07 Apr 2008, 11:55
pandeyrav wrote:
Answer to first question cannot be A.

At the first time I had the same idea. This is tricky. Absolutely A

"If Sue’s monthly salary was the same in July as in August" --clue here --> so the difference in 2 months must be from the sales
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Re: Wanna Kill "silly mistakes"? - part 1 [#permalink]

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07 Apr 2008, 12:06
notahug wrote:
pandeyrav wrote:
Answer to first question cannot be A.

At the first time I had the same idea. This is tricky. Absolutely A

"If Sue’s monthly salary was the same in July as in August" --clue here --> so the difference in 2 months must be from the sales

Sure even if it is same. lets consider the option and scenarios:

Sue’s monthly earnings were $3,620 in July and$3,580 in August.

Scenario 1: her monthly salary was 3580. Sales in July 0
from this scenario, difference in sales = 2000 (to get to 2000) and then 4% of x = (3620-3580)

scenario 2: her monthly salary was 3580. sales in july 2000
from this scenario, difference in sales = 4% of x = (3620-3580)

You can change the sales values in aug from 1 to 2000 and get as many different values for difference in sales (a range of 2000).

Hence it cannot be A.
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Re: Wanna Kill "silly mistakes"? - part 1 [#permalink]

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07 Apr 2008, 13:30
how do you solve for: (n + 2)^n = 125? I know the answer is n=3, by plug and play, but I'd like to know the formal algebraic way. Thanks
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Re: Wanna Kill "silly mistakes"? - part 1 [#permalink]

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07 Apr 2008, 14:28
zhenmaster wrote:
how do you solve for: (n + 2)^n = 125? I know the answer is n=3, by plug and play, but I'd like to know the formal algebraic way. Thanks

125 = 5^3

(n+2)^n = 5^3
n=3
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Re: Wanna Kill "silly mistakes"? - part 1 [#permalink]

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07 Apr 2008, 18:02
GMAT TIGER wrote:
notahug wrote:
1. Sue’s monthly earnings consist of a monthly salary and a 4 percent commission on the portion of her monthly sales that is in excess of $2,000. If Sue’s monthly salary was the same in July as in August, how much greater were her sales in July than in August? (1) Sue’s monthly earnings were$3,620 in July and $3,580 in August. (2) Sue’s monthly salary was$3,500 in July and in August.

this is how got A.

sales in july = y + 2000
sales in aug = z + 2000

monthly earnings in july, j= x + 4% y
monthly earnings in august, a = x + 4% z

3,620 = 2,000 + 4% y .......................i
3,580 = 2,000 + 4% z ............................ii

40 = 4% of (y - z )
(y - z ) = 1000

July sales - August sales = 1,000

so A.
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Re: Wanna Kill "silly mistakes"? - part 1 [#permalink]

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08 Apr 2008, 11:30
n is an interger
(1) n(n + 2) = 15
(2) (n + 2)^n = 125

this not the easiest this is the trickiest

bcoz when i 1st sat to solve the problem then i got eith this

(n+2)^n=5^3

so base need to be same but the main thing is n=3 ;
so n+2=5
Re: Wanna Kill "silly mistakes"? - part 1   [#permalink] 08 Apr 2008, 11:30
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