Advanced MathEasy–MediumExtra customers between two days of doubling
Advanced Math practice question
In its first week, a new shop's number of customers doubled every day: 5 on day 1, 10 on day 2, and so on. How many more customers came on day 4 than on day 2?
Answer: 30
Day 2 had 10 and day 4 had 40, so the difference is 30.
Common wrong answers
- If you answered 10
- 10 is the difference in days times 5, treating the growth as linear.
- If you answered 20
- 20 doubles day 2 without subtracting.
- If you answered 40
- 40 is day 4 alone.
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