GMATH practice exercise (Quant Class 1)
In the figure shown, lines m and n are parallel and all angles are measured in degrees. What is the value of k?
(A) 18
(B) 20
(C) 22
(D) 25
(E) 27
Answer: [spoiler]_____(B)__[/spoiler]
In the figure shown, all angles are measured in degrees. Wha
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- fskilnik@GMATH
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$$? = k\,\,\,\left[ {{\rm{degrees}}} \right]$$
$$\left( {5k\,\,{\rm{is}}\,\,{\rm{exterior}}\,\,{\rm{angle}}\,{\rm{for}}\,\,\Delta } \right)\,\,\,:\,\,\,\,5k = \left( {180 - 6k} \right) + \left( {k + k} \right)\,\,\,\,\,\, \Rightarrow \,\,\,\,\,\,9k = 180\,\,\,\,\,\,\, \Rightarrow \,\,\,\,\,\,\left( {\rm{B}} \right)$$
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Fabio.
Fabio Skilnik :: GMATH method creator ( Math for the GMAT)
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