Advanced Math practice question

Answer: 16

20 years is 4 doubling periods, so the factor is 2⁴ = 16.

Common wrong answers

If you answered 4

4 is the number of doublings, not the factor.

If you answered 8

8 is 2³, three doublings (15 years).

If you answered 40

40 is 2 × 20, treating the growth as linear.

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