Reza's average in four tests is 80% . what marks does he need in his fifth test to raise his average to 84% .
A
96%
B
94%
C
84%
D
100%
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%