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A solution contains a mixture of two iso...

A solution contains a mixture of two isotopes A (`half-life=10days`) and B (`half-life=5days`). Total activity of the mixture is `10^10` disintegration per second at time `t=0`. The activity reduces to `20%` in `20 days`. Find (a) the initial activities of A and B, (b) the ratio of initial number of their nuclei.

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The correct Answer is:
`[(a) 0.73xx10^(10) dps 0.27xx10^(10) dps, (b) 5.4]`
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