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The value of x is 1/8.

1. x₀ = x₀/8
2. x₀/2³ → t = 3T = 3 × 20 = 60 years
3. t = 3 × 20 = 60 years
4. t = 3 × 20 = 60 years

Correct answer: t = 3 × 20 = 60 years

Solution

The question appears to involve a decay or exponential relationship, where x = 1/8 suggests a factor of 2³. The time calculation t = 3 × 20 = 60 years aligns with this reasoning.

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