A) \[{{15}^{o}}\]
B) \[{{30}^{o}}\]
C) \[{{18}^{o}}\]
D) \[{{36}^{o}}\]
Correct Answer: C
Solution :
\[{{x}^{o}}+4{{x}^{o}}={{90}^{o}}\] \[\Rightarrow \]\[{{x}^{o}}=\frac{{{90}^{o}}}{5}={{18}^{o}}\]
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