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ETS questions: Plz share Solving Tricks/Methods

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by farooq » Tue Nov 17, 2009 7:31 am
If [x] is the greatest integer less than or equal to x, what is the value of [-1.6] + [3.4] + [2.7]?

(A) 3
(B) 4
(C) 5
(D) 6
(E) 7

Before leaving on a trip, Ms. Rodes exchanged 500 United States dollars for German marks at an exchange rate of 1.55 marks per dollar. When the trip was canceled, she exchanged the total amount of marks for dollars at an exchange rate of 0.60 dollar per mark. What was the total amount, in dollars, that she lost through the two transactions?

(A) $20.00
(B) $30.00
(C) $35.00
(D) $45.00
(E) $55.00

For a certain company, operating costs and commissions totaled $550 million in 1990, representing an increase of 10 percent from the previous year. The sum of operating costs and commissions for both years was

(A) $1,000 million
(B) $1,050 million
(C) $1,100 million
(D) $1,150 million
(E) $1,155 million


Fox jeans regularly sell for $15 a pair and Pony jeans regularly sell for $18 a pair. During a sale these regular unit prices are discounted at different rates so that a total of $9 is saved by purchasing 5 pairs of jeans: 3 pairs of Fox jeans and 2 pairs of Pony jeans. If the sum of the two discounts rates is 22 percent, what is the discount rate on Pony jeans?

(A) 9%
(B) 10%
(C) 11%
(D) 12%
(E) 15%


Question - https://www.urch.com/forums/attachments/ ... temp11.jpg

Question - https://www.urch.com/forums/attachments/ ... temp22.jpg
[/url]
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London. UK

It is your Attitude, not your Aptitude, that determines your Altitude.
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by farooq » Wed Nov 18, 2009 12:58 am
Before leaving on a trip, Ms. Rodes exchanged 500 United States dollars for German marks at an exchange rate of 1.55 marks per dollar. When the trip was canceled, she exchanged the total amount of marks for dollars at an exchange rate of 0.60 dollar per mark. What was the total amount, in dollars, that she lost through the two transactions?

(A) $20.00
(B) $30.00
(C) $35.00
(D) $45.00
(E) $55.00

Before leaving Rodes had $500.

After conversion, money that Rodes received = 500*1.55 = 775

Now, trip is cancled. Rodes convert 775 (German Marks) into XX dollars.
775*0.6 = $465

Total Lost = 500-465 = $35
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by papgust » Wed Nov 18, 2009 1:06 am
farooq wrote:For a certain company, operating costs and commissions totaled $550 million in 1990, representing an increase of 10 percent from the previous year. The sum of operating costs and commissions for both years was[/b]

(A) $1,000 million
(B) $1,050 million
(C) $1,100 million
(D) $1,150 million
(E) $1,155 million
550 million $ is the current year total of operating costs and commissions after a 10% increase from the previous year.
Assume previous year's operating costs and commissions = x

Therefore, 550 = 1.1 * x
x=500

The sum of operating costs and commissions for both years = 500 + 550 = 1050 million (B)
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by farooq » Wed Nov 18, 2009 1:17 am

Fox jeans regularly sell for $15 a pair and Pony jeans regularly sell for $18 a pair. During a sale these regular unit prices are discounted at different rates so that a total of $9 is saved by purchasing 5 pairs of jeans: 3 pairs of Fox jeans and 2 pairs of Pony jeans. If the sum of the two discounts rates is 22 percent, what is the discount rate on Pony jeans?

(A) 9%
(B) 10%
(C) 11%
(D) 12%
(E) 15%

Guys...I tried and solved this question too..

Fox's Jeans price/pair=15
Poney's Jeans price/pair=18

discount on Fox's jeans = x
discount on Pony's jeans = y

Total no. of pairs of jeans = 5

3*15 = 45
2*18 = 36

(Fox)some discount on 45 = x/100 (45)
(Pony)some discount on 36 = y/100 (36)

sum of both discount = 9.

x/100 (45) + x/100 (36) = 9

45x + 36y=900
15x + 12y = 300

sum of the two discounts rates = 22 (given)

x + y = 22
15x + 12y = 300

y = ?

y = 10% (discount rate on pony's jeans)
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by thephoenix » Wed Nov 18, 2009 2:55 am
If [x] is the greatest integer less than or equal to x, what is the value of [-1.6] + [3.4] + [2.7]?

(A) 3
(B) 4
(C) 5
(D) 6
(E) 7

IMO D

-1+4+3=6

OA pls??
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by thephoenix » Wed Nov 18, 2009 2:59 am
Question - https://www.urch.com/forums/attachments/ ... temp11.jpg


ans to above link is C

as in a cube we have 12 edges, 6 faces and 8 vertices

so option c is the best
12-6=8-2

OA pls????
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by thephoenix » Wed Nov 18, 2009 3:03 am
Question - https://www.urch.com/forums/attachments/ ... temp22.jpg
[/url]

ans to above link is c
soln:
x3=2x2-1/2(x1)

x2=2x1-1/2(x0)
=2*2-1/2*(3)
=5/2

hence x3=2*5/2-1/2*2=5-1=4

OA pls
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by farooq » Wed Nov 18, 2009 7:29 am
thephoenix wrote:Question - https://www.urch.com/forums/attachments/ ... temp11.jpg


ans to above link is C

as in a cube we have 12 edges, 6 faces and 8 vertices

so option c is the best
12-6=8-2

OA pls????

Answer is D
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by thephoenix » Wed Nov 18, 2009 8:34 am
farooq wrote:
thephoenix wrote:Question - https://www.urch.com/forums/attachments/ ... temp11.jpg


ans to above link is C

as in a cube we have 12 edges, 6 faces and 8 vertices

so option c is the best
12-6=8-2

OA pls????

Answer is D
yeah it was a typo its actually D
e-f is 12-6 and v-2 is 8-2
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by farooq » Wed Nov 18, 2009 8:50 am
thephoenix wrote:Question - https://www.urch.com/forums/attachments/ ... temp22.jpg
[/url]

ans to above link is c
soln:
x3=2x2-1/2(x1)

x2=2x1-1/2(x0)
=2*2-1/2*(3)
=5/2

hence x3=2*5/2-1/2*2=5-1=4

OA pls
4 is the correct answer. At the time of practice, I tried to solve it by putting x=0, then x=1....because of that method, I got very complex equations that forced me to marked wrong answer :(

Really GMAT questions are simple but tricky. A person who framed GMAT questions knows all areas where maximum test takers commit mistakes.
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by hpgmat » Wed Nov 18, 2009 10:11 am
thephoenix wrote:If [x] is the greatest integer less than or equal to x, what is the value of [-1.6] + [3.4] + [2.7]?

(A) 3
(B) 4
(C) 5
(D) 6
(E) 7

IMO D

-1+4+3=6

OA pls??
-2 + 3 + 2 = 3 ------------------------ Answer A
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