Tommy and Dennis went fishing. Dennis caught 5 more fish than Tommy. If they caught a total of 15 fish, how many fish did each of them catch. Hint: let x = the number of fish Tommy caught.
Please help with this I don't know where to start..

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ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

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