The average mark of student in 4 subjects is 75. If the student obtained 80 marks in the fifth subject, then the new average is-
A. 72.5 B. 76 C. 77 D. 77.5 Answer: Option BShow Answer
Solution(By Apex Team)
$\begin{array}{l}\text{Sum of marks in 4 subjects}\\
\text{= 75 × 4}\\
\text{= 300}\\
\text{Sum of marks in 5 subjects}\\
\text{= 300 + 80}\\
\text{= 380}\\
\text{∴ New average}\\
=\Large\frac{380}{5}\\
=76\end{array}$
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