Gujarati
Hindi
4.Average
medium

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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