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4.Average
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The average of $13$ results is $50 .$ If the average of first $7$ results is $52$ and that of last $7$ results is $49,$ find the $7^{th}$ result.
A
$50$
B
$52$
C
$56$
D
$57$
Solution
Average of $13$ results $=50$
Average of first $7$ results $=52$
Average of last $7$ results $=49$
$\therefore$ The $7^{th}$ result $=7 \times 52+7 \times 49-13 \times 50=57$
Standard 13
Quantitative Aptitude
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