Advanced Math practice question

Answer: 5

Day 1: 5, day 2: 15, day 3: 45, day 4: 135, day 5: 405. Day 5 is the first over 300.

Common wrong answers

If you answered 4

On day 4 the number is 135.

If you answered 6

Day 6 is later than needed; day 5 already exceeds 300.

If you answered 60

60 comes from 300 ÷ 5, treating growth as linear.

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