Two elements P and Q have half-line of 1...

Two elements `P` and `Q` have half-line of `10` and `15` minutes repectively. Freshly preapared sample of mixuture containing equal number of atoms is allowed to decay for `30` minutes. The ratio of number of atoms of `P` and `Q` in left in mixture is:

0.5

`2.0`

`1.0`

`3.0`

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