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
Latest: SSC CGL preparation tips to crack the exam
Don't Miss: SSC CGL complete guide
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.
Related Questions
Know More about
Staff Selection Commission Combined Grad ...
Answer Key | Eligibility | Application | Selection Process | Preparation Tips | Result | Admit Card
Get Updates BrochureYour Staff Selection Commission Combined Graduate Level Exam brochure has been successfully mailed to your registered email id “”.