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If a rectangular room measures 10 meters by 6 meters by 4 [#permalink]
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12 Mar 2006, 13:21
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If a rectangular room measures 10 meters by 6 meters by 4 meters, what is the volume of the room in cubic centimeters? (1 meter=100 centimeters) A. 24,000 B. 240,000 C. 2,400,000 D. 24,000,000 E. 240,000,000
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Last edited by Bunuel on 13 Apr 2015, 03:49, edited 1 time in total.
Added the OA.



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Re: If a rectangular room measures 10 meters by 6 meters by 4 [#permalink]
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12 Apr 2015, 19:48
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Hi All, This question has a great Number Property 'shortcut' built into it; when combined with the answer choices, you can avoid almost all of the 'math' in this question. We're told that the dimensions of a rectangular room are 10 meters by 6 meters by 4 meters. We're asked for the volume of the room in cubic CENTIMETERS? (1 meter=100 centimeters). Converting the dimensions from meters to centimeters is pretty straightforward  we just have to multiply each number by 100: 10 meters by 6 meters by 4 meters becomes... 1000 cm by 600 cm by 400 cm Notice that these three numbers include 7 zeroes. When we multiply them together, the correct answer MUST have at AT LEAST 7 zeroes. Looking at the answer choices, there's only one answer that fits: Final Answer: GMAT assassins aren't born, they're made, Rich
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Re: If a rectangular room measures 10 meters by 6 meters by 4 [#permalink]
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12 Mar 2006, 13:24
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E. 240,000,000
10*100*6*100*4*100 = 240,000,000



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Re: If a rectangular room measures 10 meters by 6 meters by 4 [#permalink]
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15 Jul 2016, 16:00
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zxcvbnmas wrote: Why cant we multiply 10 * 6 * 4 =240 meters first and then multiply 240 with centimeters? You can, and that way is much easier in my opinion. 10 * 6 * 4 = 240 meters cubed 1 meter = 100 cm 1 meter squared = (100cm)^2 = 10000 cm sq. 1 meter cubed = (100cm)^3 = 1000000 cm cubed So 240 meter cubed * 1000000 cm^3/1m^3 = answer E buckkitty wrote: If a rectangular room measures 10 meters by 6 meters by 4 meters, what is the volume of the room in cubic centimeters? (1 meter=100 centimeters)
A. 24,000 B. 240,000 C. 2,400,000 D. 24,000,000 E. 240,000,000 Sent from my SMG928T using GMAT Club Forum mobile app



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Re: If a rectangular room measures 10 meters by 6 meters by 4 [#permalink]
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12 Apr 2015, 18:10
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Re: If a rectangular room measures 10 meters by 6 meters by 4 [#permalink]
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15 Jul 2016, 15:33
Why cant we multiply 10 * 6 * 4 =240 meters first and then multiply 240 with centimeters?
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If a rectangular room measures 10 meters by 6 meters by 4 [#permalink]
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09 Oct 2016, 13:47
Quicker approach, step by step:
1) Volume in meters: 6 x 10 x 4 = 240 m³
2) 1 m = 100 cm = 10² cm ... so substitute "1 m = 100 cm" into 240 m³ and multiply
3) 240 m³ = 240 * (100)³ 240 m³ = 240 * (10²)³ 240 m³ = 240 * 10 ^ 6
so 240 m³ = 240 PLUS 6 zeroes 240 m³ = 240,000,000




If a rectangular room measures 10 meters by 6 meters by 4
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