SSC CGL 3 Sep 2016 Paper

Question : 63 of 100

Marks: +1, -0

Nine students of 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 others. The average contribution of the class of 9 students is :

Rs. 70
Rs. 50
Rs. 100
Rs. 120

Validate

Solution:

Average contribution of 9 students of the class = Rs. x (let).
According to the question,

{7×50+x+50+x+90}/{9}

= x
⇒ 350 + 2x + 140 = 9x
⇒ 9x - 2x = 490
⇒ 7x = 490
⇒ x =

{490}/7

= Rs. 70

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