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20-07-2020
Mathematics

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The half-life of a radioactive substance is 20 years. If you start with some amount of this substance, what fraction will remain in 120 years?

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20-07-2020

Answer:

1/64

Step-by-step explanation:

20 years = 1/2

40 years = 1/4

60 years = 1/8

80 years = 1/16

100 years = 1/32

120 years = 1/64

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