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Question : Nine students in a class contribute a certain sum of money. Seven of them gave Rs. 50 each, and the other two gave, respectively, Rs. 50 and Rs. 90 more than the average contribution. The average contribution of the class of nine students is:

Option 1: Rs. 70

Option 2: Rs. 50

Option 3: Rs. 100

Option 4: Rs. 120


Team Careers360 1st Jan, 2024
Answer (1)
Team Careers360 13th Jan, 2024

Correct Answer: Rs. 70


Solution : Let the average contribution of the class of nine students be $x$.
$x=\frac{7×50+x+50+x+90}{9}$
⇒ $9x=2x+490$
⇒ $7x=490$
$\therefore x=70$
Hence, the correct answer is 70.

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