Candidates of four schools appear in a mathematics test. The data were as follows: W \begin{tabu...

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Candidates of four schools appear in a mathematics test. The data were as follows:
W
\begin{tabular}{ccc}
\hline Schools & No. of Candidates & Average Score \\
\hline I & 60 & 75 \\
II & 48 & 80 \\
III & Not available & 55 \\
IV & 40 & 50 \\
\hline
\end{tabular}
If the average score of the candidates of all the four schools is 66 , find the number of candidates that appeared from school III.
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