Given that there are 18 participants from country S, find the number of participants from country R.
A) \[18\]
B) \[21\]
C) \[27\]
D) \[42\]
Correct Answer: D
Solution :
\[{{x}^{o}}+{{90}^{o}}+2{{x}^{o}}+{{60}^{o}}={{360}^{o}}\] \[\Rightarrow \] \[x={{70}^{o}}\] \[R=2{{x}^{o}}={{140}^{o}}\] \[{{60}^{o}}\to 18\] participants \[{{140}^{o}}\to \,\,?\] \[\Rightarrow \] \[\frac{{{140}^{o}}\times 18}{{{60}^{o}}}=42\]
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