Rahim averaged 70 in his first m number of exams. After taking n more exams, he had an overall average of In terms of m and n, his average for the last n exams was?
সঠিক উত্তর: Option B
m টি exam এ মোট marks= 70m
m+n টি exam এ মোট marks= 75 (m+n)
n টি exam এর মোট marks = 75 (m+n) - 70m = 5m+75n
n টি exam এর average = (5m+75n)/n = (5m/n)+75