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15 Jan 2019, 00:59
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Difficulty:
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94% (00:44) correct
6%
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[Math Revolution GMAT math practice question]
A rectangular wall has dimensions of \(800\) by \(300\). If the wall is tiled using tiles measuring \(12 x 25\) of the same units, how many tiles are used?
\(A. 360\)
\(B. 400\)
\(C. 500\)
\(D. 600\)
\(E. 800\)
A rectangular wall has dimensions of \(800\) by \(300\). If the wall is tiled using tiles measuring \(12 x 25\) of the same units, how many tiles are used?
\(A. 360\)
\(B. 400\)
\(C. 500\)
\(D. 600\)
\(E. 800\)
Archit3110
Major Poster
15 Jan 2019, 02:52
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MathRevolution
800* 300/12*25
solve
we get
800
IMOE
15 Jan 2019, 05:50
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MathRevolution
Trivial application of UNITS CONTROL, one of the most powerful tools of our method!
(We assume the units length is centimeters, just for didactic reasons.)
\(?\,\,\, = \,\,\,800 \cdot 300\,\,{\rm{c}}{{\rm{m}}^2}\,\,\left( {{{1\,\,{\rm{tile}}} \over {12\, \cdot 25\,\,{\rm{c}}{{\rm{m}}^2}}}} \right)\,\,\,\, = \,\,\,\,{{800 \cdot 3 \cdot 4 \cdot 25} \over {3 \cdot 4 \cdot 25}}\,\,{\rm{tiles}}\,\,\, = \,\,\,800\,\,\,{\rm{tiles}}\)
This solution follows the notations and rationale taught in the GMATH method.
Regards,
Fabio.
