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4.Average
medium
Average of $a, b$ and $c$ is $11 ;$ average of $c, d$ and $e$ is $17 ;$ average of $e$ and $f$ is $22$ and average of $e$ and $c$ is $17 .$ Find out the average of $a, b,$ $c , d , e$ and $f ?$
A
$15 \frac{2}{3}$
B
$18 \frac{1}{2}$
C
$21 \frac{1}{3}$
D
$16 \frac{1}{2}$
Solution
Total of $a+b+c=33, c+d+e=51$
$e+f=44, \quad e+c=34, \quad d=51-34=17$
$a+b+c+d+e+f=33+17+44=94$
Average of $a, b, c, d, e, f=\frac{94}{6}=15 \frac{2}{3}$
Standard 13
Quantitative Aptitude