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Rahim averaged 70 in his first m number of exams. After taking n more exams, he had an overall average of 75. In terms of m and n, his average for the last n exams was

Rahim averaged 70 in his first m number of exams. After taking n more exams, he had an overall average of 75. In terms of m and n, his average for the last n exams was Correct Answer None of these

m সংখ্যক exam - এ প্রাপ্ত নম্বরের সমষ্টি 70m ধীর, n সংখ্যক exam - এ গড় x; ∴ n সংখ্যক exam - এর সমষ্টি nx প্রশ্নমতে, 70m + nx = 75m + n⇒70m + nx = 75m + 75n⇒nx = 5m + 75n⇒x = 5m + 75nn = 5mn + 75

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