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4.Average
medium
The mean of $11$ numbers is $35 .$ If the mean of first $6$ numbers is $32$ and that of the last $6$ numbers is $37,$ then find the sixth number.
A
$28$
B
$29$
C
$30$
D
$27$
Solution
Some of all $11$ Number $=35 \times 11=385$
Some of First $6$ Number $=32 \times 6=192$
Some of last $6$ Number $=37 \times 6=222$
Sixth number $=192+222-385=414-385=29$
Standard 13
Quantitative Aptitude