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 DShow Answer
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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