A. 52

B. 57

C. 58

D. 62

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### Solution(By Apex Team)

Let the mean marks of the third group be x. Then, $\begin{array}{l}\Rightarrow\Large\frac{25\times60+50\times55+25\times x}{25+50+25}=\small58\\ \Rightarrow1500+2750+25x=5800\\ \Rightarrow25x=1550\\ \Rightarrow x=62\end{array}$