ABC26GN1526 · Average

Subject: General Aptitude · Chapter: Average · Exam: 2009 · Marks: · Difficulty:

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

Answer (as printed): E

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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