If 25 a+25 b=115, what is the average of a and b ? · ABC26GN1526
Subject: General Aptitude · Chapter: Average · Exam: Bank P.O. 2009
If $25 a+25 b=115$, what is the average of $a$ and $b$ ?
(a)2.5
(b)3.4
(c)4.5
(d)4.6
(e)None of these
Answer
Explanation
$25 a+25 b=115 \Rightarrow 25(a+b)=115$ $$\Rightarrow a+b=\frac{115}{25}=\frac{23}{5} .$$ ∴ Average of $a$ and $b=\frac{a+b}{2}=\frac{23}{5} \times \frac{1}{2}=\frac{23}{10}=2.3$.
Explanation as extracted from the printed page; notation may be imperfect.
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