ABC26GN1528 · Average

Subject: General Aptitude · Chapter: Average · Exam: 2007 · Marks: · Difficulty:

If the arithmetic mean of 0,5,4,3 is $a$, that of -1, 0, 1, 5, 4, 3 is $b$ and that of 5, 4, 3 is $c$, then the relation between $a, b$ and $c$ is

(a)$a=b=c$

(b)$a: b: c=3: 2: 4$

(c)$4 a=5 b=c$

(d)$a+b+c=12$

Answer

Answer (as printed): B

Explanation

We have: $a=\frac{0+5+4+3}{4}=3 ; b=\frac{-1+0+1+5+4+3}{6}=2$; $$c=\frac{5+4+3}{3}=4 .$$ $\therefore a: b: c=3: 2: 4$.

Explanation as extracted from the printed page; notation may be imperfect.