A mixture consists of two radioactive ma...

A mixture consists of two radioactive materials `A_1` and `A_2` with half-lives of 20 s and 10 s respectively. Initially the mixture has 40 g of `A_1` of 160 g of `A_2`. After what time of amount of the two in the mixture will become equal ?

60 s

80 s

20 s

40s

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