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4.Average
medium
The average weight of three boys $A, B$ and $C$ is $54 \frac{1}{3} \,kg,$ while the average weight of three boys $B , D$ and $E$ is $53 \,kg .$ What is the average weight of $A , B , C , D$ and $E$ ?(in $kg$)
A
$52.4$
B
$53.2$
C
$53.8$
D
Data inadequate
Solution
Average weight of $A , B$ and $C =\frac{a+b+c}{3}=54 \frac{1}{3} kg$
Average weight of $B , D$ and $E =\frac{b+d+e}{3}=53 kg$
Standard 13
Quantitative Aptitude