Question

The average weight of 25 students is 16 kg. The average weight of the first 12 students is 14 kg and of the last 12 students is 17 kg, Find the weight of the thirteenth student .

• A. 29 kg
• B. 22 kg
• C. 27 kg
• D. 24 kg
• E. None of these

Answer 1

The correct option is E None of these


Sum of the weight of 25 students
$=(25\times 16)kg$
Sum of the weight of first 12 students
$=(14\times 12)kg=168kg$
Sum of the weight of last 12 students
$=(17\times 12)kg=204kg$
$\therefore$ Weight of the thirteenth student
$=(400-168-204)kg=28kg$