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If 25a + 25b = 115, what is the average of a and b?

A. 2.5 B. 3.4 C. 4.5 D. None of these Answer: Option D
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Solution(By Apex Team)

$\begin{aligned}&25a+25b=115\\ \Rightarrow&25(a+b)=115\\ \Rightarrow&a+b=\frac{115}{25}\\ \Rightarrow&a+b=\frac{23}{5}\\ &\end{aligned}$ $\begin{array}{l}\text{∴ Average of a and b}\\ \begin{array}{l} =\Large\frac{a+b}{2} \\ =\Large\frac{23}{5} \times \frac{1}{2} \\ =\Large\frac{23}{10} \\ =2.3 \end{array}\end{array}$

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