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If Jim earns x dollars per hour, it will take him 4 hours to [#permalink]

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05 Jul 2011, 14:23

4

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A

B

C

D

E

Difficulty:

55% (hard)

Question Stats:

58% (02:08) correct
42% (00:59) wrong based on 264 sessions

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If Jim earns x dollars per hour, it will take him 4 hours to earn exactly enough money to purchase a particular jacket. If Tom earns y dollars per hour, it will take him exactly 5 hours to earn enough money to purchase the same jacket. How much does the jacket cost?

--------------------------------------------------------------------------------------- If you think you can,you can If you think you can't,you are right.

It is given tom earns X $ per hour and it takes him 4 hrs to purchase the jacket. so price of jacket 4x $. Now jim earns Y and it takes him 5hrs to earn enough to buy the jacket. So jacket's price = 5y.

so 4x= 5y thus x= 5y/4.

(1) Insufficient. - It is a redundant information. The question stem already gives the relation between x and y.

(2) sufficient - x + y = 43.75, so substitute the value of x for y. 5y/4 + y =43.75 >> 9y= 43.75 * 4 >> the price of jacket is 5y , so price = 43.75* 5*4 /9 = 875/9 $

If Jim earns x dollars per hour, it will take him 4 hours to earn exactly enough money to purchase a particular jacket. If Tom earns y dollars per hour, it will take him exactly 5 hours to earn enough money to purchase the same jacket. How much does the jacket cost?

(1) Tom makes 20% less per hour than Jim does.

(2) x + y = $43.75

You can also use ratios here to arrive at answer (B) in moments.

Time taken by Jim : Time take by Tom = 4:5 Hourly rate of Jim : Hourly rate of Tom = 5:4 = x:y (Since Money Earned = Hourly Rate * Time and Money to be earned is the same for both Jim and Tom)

Statement 1: We already know that hourly rate of Tom is 20% less than the hourly rate of Jim (because it is in the ratio 5:4). No information about actual dollar amount so not sufficient.

Statement 2: On the ratio scale, x+y is 9 but it is actually 43.75. So we can get the values of x and y and hence can find the cost of the jacket. Sufficient. Answer (B)

Note: You don't need to calculate the cost of the jacket. You just need to say whether you can calculate it.

If Jim earns x dollars per hour, it will take him 4 hours to earn exactly enough money to purchase a particular jacket. If Tom earns y dollars per hour, it will take him exactly 5 hours to earn enough money to purchase the same jacket. How much does the jacket cost?

(1) Tom makes 20% less per hour than Jim does.

(2) x + y = $43.75

B For me as A and the information given in the question are same

B give an additional equation which is required to solve for the values

I wish these types of questions come in my real GMAT....... _________________

WarLocK _____________________________________________________________________________ The War is oNNNNNNNNNNNNN for 720+ see my Test exp here http://gmatclub.com/forum/my-test-experience-111610.html do not hesitate me giving kudos if you like my post.

Re: If Jim earns x dollars per hour, it will take him 4 hours [#permalink]

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19 Nov 2011, 12:44

4x = 5y => x/y = 4/5

Statement (1) just restates this fact, so nothing new here. Insufficient. Statement (2) gives us another equation in x and y which we can solve to find x (or y) and calculate 4x or 5y. Sufficient.

Re: If Jim earns x dollars per hour, it will take him 4 hours [#permalink]

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11 Feb 2012, 17:10

+1 B solve for x and solve for y. x = price of jacket / 4 and y = p/5. when you know the relative rates of x and y they only tell you what p equals each other... X + Y will you the rates and setting p/4 + p/5 you can solve what p is equal to. _________________

Re: If Jim earns x dollars per hour, it will take him 4 hours [#permalink]

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08 May 2013, 16:15

I dont understand why A is not sufficient. If tom earns 80% of what Jim makes, then i get the equation .8x(5)=x(4) where I got x=6.25 plug that back into the givens and I get the answer for J. I understand how you can say that this is not giving us new information but when you plug it back in you get an answer for J.

Here was my math

.8x(5)=x(4)

5=.2x(4) 1.25=.2x x=6.25

Can someone help me understand where I went off into the wrong direction? Ive got this problem wrong 3x in the course of my studies and cannot understand where I am losing it. Thanks

Re: If Jim earns x dollars per hour, it will take him 4 hours [#permalink]

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08 May 2013, 21:38

Expert's post

Richard0715 wrote:

I dont understand why A is not sufficient. If tom earns 80% of what Jim makes, then i get the equation .8x(5)=x(4) where I got x=6.25 plug that back into the givens and I get the answer for J. I understand how you can say that this is not giving us new information but when you plug it back in you get an answer for J.

Here was my math

.8x(5)=x(4)

5=.2x(4) 1.25=.2x x=6.25

Can someone help me understand where I went off into the wrong direction? Ive got this problem wrong 3x in the course of my studies and cannot understand where I am losing it. Thanks

Jim earns 4*x dollars in 4 hours = price of the jacket = 4x. Similarly, Tom earns 5*y dollars in 5 hours = price of the same jacket = 5y. Thus as 4x = 5y, we have y = 0.8x

Now from F.S 1, we know that Tom makes 80% of what Jim earns per hour--> Thus, y = 0.8x. This is exactly what we had, without the aid of any Fact Statements. Thus Insufficient. _________________

If Jim earns x dollars per hour, it will take him 4 hours to earn exactly enough money to purchase a particular jacket. If Tom earns y dollars per hour, it will take him exactly 5 hours to earn enough money to purchase the same jacket. How much does the jacket cost?

If Jim earns x dollars per hour, it will take him 4 hours to earn exactly enough money to purchase a particular jacket. If Tom earns y dollars per hour, it will take him exactly 5 hours to earn enough money to purchase the same jacket. How much does the jacket cost?

(1) Tom makes 20% less per hour than Jim does.

(2) x + y = $43.75

Merging similar topics. Please refer to the solutions above. _________________

Re: If Jim earns x dollars per hour, it will take him 4 hours to [#permalink]

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13 Aug 2015, 23:11

mojorising800 wrote:

If Jim earns x dollars per hour, it will take him 4 hours to earn exactly enough money to purchase a particular jacket. If Tom earns y dollars per hour, it will take him exactly 5 hours to earn enough money to purchase the same jacket. How much does the jacket cost?

(1) Tom makes 20% less per hour than Jim does.

(2) x + y = $43.75

Jim x dollars 4 hours Tom y dollars 5 hours Since 4x = 5y, x/y 5/4; it implies y is 20% less than x Therefore, statement (1) is redundant.

state(2) x+y =43.75 4x=5y therefore, x and y can be found It is sufficient to answer the question

gmatclubot

Re: If Jim earns x dollars per hour, it will take him 4 hours to
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13 Aug 2015, 23:11

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