He average of marks obtained by 120 candidates in a certain examination is 35. If the average marks of passed candidates is 39 and that of failed candidates is 15, what is the number of candidates who passed the examination?
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Step-by-step explanation:
Let the number of passed candidates be x.
Total marks secured by 120 candidates = 120×35 = 4200
39x+(120−x)×15=4200
39x+1800−15x=4200
24x=4200−1800=2400
x = 100
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