A group of 9 people can survive on₹8,100 for30 days. How long can a group of 7 people survive on₹8,400?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e 40 days.
Total consumption for 9 people in 30 days = 9 × 30 = 270 person-days
So, ₹8,100 is enough for 270 person-days
Cost per person-day = 8,100 ÷ 270 = ₹30
With ₹8,400, total person-days possible = 8,400 ÷ 30 = 280 person-days
For 7 people, days = 280 ÷ 7 = 40