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4.Average
easy
The mean weight of $34$ students of a school is $42 \,kg$. If the weight of the teacher be included, the mean rises by $400 \,g$. Find the weight of the teacher (in $kg$).
A
$55$
B
$57$
C
$66$
D
$56$
Solution
Weight of the teacher $=42.4 \times 35-42 \times 34=56 kg$
Standard 13
Quantitative Aptitude
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