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A sheet of rectangular paper measures 12 cm by 20 cm. At the

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A sheet of rectangular paper measures 12 cm by 20 cm. At the [#permalink]  09 Oct 2020, 04:45
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Question Stats:

84% (00:48) correct 15% (01:36) wrong based on 19 sessions
A sheet of rectangular paper measures 12 cm by 20 cm. At the edge of the paper, a margin exactly 1-cm wide is painted all the way around. What percentage of the area of the original rectangle remains unpainted?

A. 95%

B. 90%

C. 85%

D. 80%

E. 75%
[Reveal] Spoiler: OA

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Re: A sheet of rectangular paper measures 12 cm by 20 cm. At the [#permalink]  12 Oct 2020, 09:33
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The 1cm around margin will be the length minus 2 and the breadth also minus 2

Original area is 12*20=240
Unpainted area is 10*18=180
Percentage area is 180/240*100=75%

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Re: A sheet of rectangular paper measures 12 cm by 20 cm. At the   [#permalink] 12 Oct 2020, 09:33
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