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The measurements obtained for the interior dimensions of a [#permalink]

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22 Sep 2013, 07:22

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The measurements obtained for the interior dimensions of a rectangular box are 200 cm by 200 cm by 300cm. If each of the three measurements has an error of at most 1 centimeter, which of the following is the closes maximum possible difference, in cubic centimeters, between the actual capacity of the box and the capacity computed using these measurements?

A. 100,000 B. 120,000 C. 160,000 D. 200,000 E. 320,000

The measurements obtained for the interior dimensions of a rectangular box are 200 cm by 200 cm by 300cm. If each of the three measurements has an error of at most 1 centimeter, which of the following is the closes maximum possible difference, in cubic centimeters, between the actual capacity of the box and the capacity computed using these measurements?

A. 100,000 B. 120,000 C. 160,000 D. 200,000 E. 320,000

The options are well spread so we can approximate.

Changing the length by 1 cm results in change of the volume by 1*200*300 = 60,000 cubic centimeters; Changing the width by 1 cm results in change of the volume by 200*1*300 = 60,000 cubic centimeters; Changing the height by 1 cm results in change of the volume by 200*200*1 = 40,000 cubic centimeters.

So, approximate maximum possible difference is 60,000 + 60,000 + 40,000 = 160,000 cubic centimeters.

Re: The measurements obtained for the interior dimensions of a [#permalink]

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22 Sep 2013, 22:50

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Hello Bunuel, Sorry, but I dont understand the solution. I thought,since it is given that the dimensions have at most an error of 1 cm. So maximum possible difference in volume would be: (201* 201 * 301) - (200 *200*300). Pls suggest what i am doing wrong.

Hello Bunuel, Sorry, but I dont understand the solution. I thought,since it is given that the dimensions have at most an error of 1 cm. So maximum possible difference in volume would be: (201* 201 * 301) - (200 *200*300). Pls suggest what i am doing wrong.

Posted from my mobile device

Yes, that's correct. But the way I suggested gives and approximate answer which is much easier to calculate than (201*201*301) - (200*200*300)= 160,701.
_________________

Re: The measurements obtained for the interior dimensions of a [#permalink]

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23 Sep 2013, 05:32

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Bunuel wrote:

Yes, that's correct. But the way I suggested gives and approximate answer which is much easier to calculate than (201*201*301) - (200*200*300)= 160,701.

Thanks Bunuel for the clarification. However, my solution assumes that the error of 1 cm would lead to increase in the dimensions of the boxes. Can it be possible that the resultant volume would be bigger had I taken the values(200*200*300) - (199*199*299)? I mean is there any number property that justifies that the difference would be always be bigger in the following case

If x<y<z , where x,y and z are positive numbers then y-x< z-y .

according to this question, we can assume that : x = (199*199*299) y = (200*200*300) z= (201*201*301)

Re: The measurements obtained for the interior dimensions of a [#permalink]

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23 Sep 2013, 23:26

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I had the same doubt initially as well, but then I considered an easier problem and the relationship became clear; you can prove it to yourself by considering the behavior of the area of squares, and then extrapolate that result to cuboids. Consider the area of squares with sides 1, 2, and 3; the areas woukd be 1, 4, 9. As you increase the side by one unit, the /absolute/ difference becomes increasingly large (note, however, that the /percentage/ increase becomes increasingly small).

Algebraically, and letting the length of the side be x, you can represent this difference as (x + 1)^2 - x^2 = 2x + 1.

In other words, the difference is 1 greater than twice the initial length (x), ie, it is a function /of the initial length/.

You can extrapolate this result to n dimensions, including three.

Yes, that's correct. But the way I suggested gives and approximate answer which is much easier to calculate than (201*201*301) - (200*200*300)= 160,701.

Thanks Bunuel for the clarification. However, my solution assumes that the error of 1 cm would lead to increase in the dimensions of the boxes. Can it be possible that the resultant volume would be bigger had I taken the values(200*200*300) - (199*199*299)? I mean is there any number property that justifies that the difference would be always be bigger in the following case

If x<y<z , where x,y and z are positive numbers then y-x< z-y .

according to this question, we can assume that : x = (199*199*299) y = (200*200*300) z= (201*201*301)

The red part is not always true: Consider this: x=1, y=100, and z=101.

As for the other point: Yes, (200*200*300) - (199*199*299) < (201*201*301) - (200*200*300) but \((200*200*300) - (199*199*299) \approx{ (201*201*301) - (200*200*300)}\), so you can get the answer no matter which case you consider.

My solution deals with this problem conceptually, to get approximate maximum difference, which allows to avoid calculation of (200*200*300) - (199*199*299) or (201*201*301) - (200*200*300).

Re: The measurements obtained for the interior dimensions of a [#permalink]

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25 Oct 2013, 08:30

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I have done it using an alternative solution, Bunuel please correct me if my logic is wrong:

L: 200, 1cm is a deviation of 0,5% W: 200, 1cm is a deviation of 0,5% H: 300, 1cm is a deviation of 0,33%

Summing up the deviation percentages, we obtain a total maximum deviation of 1,33%. Given that the volume 200*200*300 equals to 12,000,000 we can conclude that 1,33% of this number is around 160,000.

Re: The measurements obtained for the interior dimensions of a [#permalink]

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04 Nov 2013, 08:40

Bunuel wrote:

imhimanshu wrote:

The measurements obtained for the interior dimensions of a rectangular box are 200 cm by 200 cm by 300cm. If each of the three measurements has an error of at most 1 centimeter, which of the following is the closes maximum possible difference, in cubic centimeters, between the actual capacity of the box and the capacity computed using these measurements?

A. 100,000 B. 120,000 C. 160,000 D. 200,000 E. 320,000

Changing the length by 1 cm results in change of the volume by 1*200*300 = 60,000 cubic centimeters; Changing the width by 1 cm results in change of the volume by 200*1*300 = 60,000 cubic centimeters; Changing the height by 1 cm results in change of the volume by 200*200*1 = 40,000 cubic centimeters.

So, approximate maximum possible difference is 60,000 + 60,000 + 40,000 = 160,000 cubic centimeters.

Re: The measurements obtained for the interior dimensions of a [#permalink]

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21 Jul 2015, 05:11

For those of you familiar with derivatives from calculus can use it to arrive at the same conclusion as Bunuel stated at the beginning. Lets assume the following for the rectangular box, length(l) = 200, breadth(b) = 200, height(h) = 300

Since Volume (V) = lxbxh, taking its derivative we get the following,

dV = bxhxdl + lxhxdb + lxbxdh (here dl, db,dh refers to the difference in measurement of the length, breadth and height)

Hence, dV (which is the difference in the volume) = 200x300x1 + 200x300x1 + 200x200x1 = 160000

Re: The measurements obtained for the interior dimensions of a [#permalink]

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10 Jan 2016, 09:15

Bunuel wrote:

imhimanshu wrote:

The measurements obtained for the interior dimensions of a rectangular box are 200 cm by 200 cm by 300cm. If each of the three measurements has an error of at most 1 centimeter, which of the following is the closes maximum possible difference, in cubic centimeters, between the actual capacity of the box and the capacity computed using these measurements?

A. 100,000 B. 120,000 C. 160,000 D. 200,000 E. 320,000

The options are well spread so we can approximate.

Changing the length by 1 cm results in change of the volume by 1*200*300 = 60,000 cubic centimeters; Changing the width by 1 cm results in change of the volume by 200*1*300 = 60,000 cubic centimeters; Changing the height by 1 cm results in change of the volume by 200*200*1 = 40,000 cubic centimeters.

So, approximate maximum possible difference is 60,000 + 60,000 + 40,000 = 160,000 cubic centimeters.

Answer: C.

Hi Bunuel,

Thanks for this explanation. I had set an algebraic approach and I wanted to take out common factor but at some point I didn´t know how to go on.

Re: The measurements obtained for the interior dimensions of a [#permalink]

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21 Jan 2017, 04:32

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imhimanshu wrote:

Hello Bunuel, Sorry, but I dont understand the solution. I thought,since it is given that the dimensions have at most an error of 1 cm. So maximum possible difference in volume would be: (201* 201 * 301) - (200 *200*300). Pls suggest what i am doing wrong.

Posted from my mobile device

Hello All, I still have a doubt here. The error can be atmost 1 cm i.e +- 1cm . Therefore to maximize the difference between the Actual and the faulty volume can be (201 x 201 x 301) - (199 x 199 x 299). Then why in the above post have we assumed the (200 x 200 x 300), when we can further maximize the difference and get the value. Unfortunately this is not yielding the correct answer either. Thus, Can someone please help out.

Hello Bunuel, Sorry, but I dont understand the solution. I thought,since it is given that the dimensions have at most an error of 1 cm. So maximum possible difference in volume would be: (201* 201 * 301) - (200 *200*300). Pls suggest what i am doing wrong.

Posted from my mobile device

Hello All, I still have a doubt here. The error can be atmost 1 cm i.e +- 1cm . Therefore to maximize the difference between the Actual and the faulty volume can be (201 x 201 x 301) - (199 x 199 x 299). Then why in the above post have we assumed the (200 x 200 x 300), when we can further maximize the difference and get the value. Unfortunately this is not yielding the correct answer either. Thus, Can someone please help out.

Re: The measurements obtained for the interior dimensions of a [#permalink]

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22 Jan 2017, 09:36

Bunuel wrote:

imhimanshu wrote:

The measurements obtained for the interior dimensions of a rectangular box are 200 cm by 200 cm by 300cm. If each of the three measurements has an error of at most 1 centimeter, which of the following is the closes maximum possible difference, in cubic centimeters, between the actual capacity of the box and the capacity computed using these measurements?

A. 100,000 B. 120,000 C. 160,000 D. 200,000 E. 320,000

The options are well spread so we can approximate.

Changing the length by 1 cm results in change of the volume by 1*200*300 = 60,000 cubic centimeters; Changing the width by 1 cm results in change of the volume by 200*1*300 = 60,000 cubic centimeters; Changing the height by 1 cm results in change of the volume by 200*200*1 = 40,000 cubic centimeters.

So, approximate maximum possible difference is 60,000 + 60,000 + 40,000 = 160,000 cubic centimeters.

Answer: C.

is not it kind of overlapping? each dimension is included in 2 of the 3 products above.