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Estimation question

How many days in one stretch does a person spend brushing teeth in a lifetime?

How close can you get? Make your own guess and earn points before you look at the answer.

Guess it yourself and earn points
Show the answer and the reasoning

The answer

79 days

79 days in one stretch, day and night.

How to get there

  1. 4 min × 365 × 78 ÷ 1,440 = 79

Source: Calculation

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