Candidates of four schools appear in a mathematics test. The data were as follows:


Schools



No. of Candidates



Average Score



I


II


III


IV



60


48


Not available


40



75


80


55


50



If the average score of the candidates of all the four school is 66, find the number of candidates that appeared from school III.

Let no. of students appeared from school III = x


Schools



No. of candidates



Average score



I



60



75



II



48



80



III



x



55



IV



40



50



Given, Average score of all schools = 66


= 66


= 66


= 66


= 66



10340 – 9768 = 66x – 55x


11x = 572


x =


= 52


Therefore, no. of candidates appeared from school (III) are 52


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