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

Rahim average 70 in his first m number of exams. After taking n more exams, he had an overall average of 75. In items of m and n his average for last n exams was Correct Answer (5n/m)+75

m সংখ্যক exam - এর সমষ্টি 70m ধরি, n সংখ্যক exam - এর গড় x ∴ n সংখ্যক exam - এর সমষ্টি nx ∴ 70m + nx = 75 (m + n) ⇒ 70m + nx = 75 m + 75 m ⇒ nx = 5 m + 75n ⇒x =  5 m + 75n n = 5mn + 75

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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
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