Average Practice Test 6

Question : 38 of 40

Marks: +1, -0

At a reputed Engineering College in India, total expenses of a trimester are partly fixed and partly varying linearly along with the number of students. The average expense per students is Rs 400 when there are 20 students and Rs 300 when there are 40 students. When there are 80 students, what is the average expense per student?

Rs 250
Rs 300
Rs 330
Rs 350

Validate

Solution:

Number of students = 20
Average expense per student = Rs 400
Total expenses = 400 × 20 = Rs 8,000
Number of students = 40
Average expense per student = Rs 300
Total expenses = 40 × 300 = Rs 1,200
Total expenditure = 8,000 + 1,2000 = Rs 20,000
Number of students = 80
Average expense per student

= {20,000}/800= \Rs 250

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