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4.Average
medium
The average weight of $100$ students is $32\, kg$. The average weight of first $49$ students is $30\, kg$ and that of last $50$ students is $34\, kg$. What is the weight (in $kg$ ) of the $50^{ th }$ student ?
A
$25$
B
$30$
C
$32$
D
$33$
Solution
$\frac{49 \times 30+50 \times 34+x}{100}=32$
$1470+1700+x=3200$
$x=30$
Standard 13
Quantitative Aptitude