Reza's average in four tests is 80% . what marks does he need in his fifth test to raise his average to 84% .

Reza's average in four tests is 80% . what marks does he need in his fifth test to raise his average to 84% . Correct Answer 100%

ধরি, প্রথম 4টি exam এর যোগফল x এবং 5th exam এ পাওয়া marks y xy = 80x = 4x80and,x + y5 = 84So,Y = 5x84 - x অথাৎ 100%
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