### Cobalt Decay

Investigate the effects of the half-lifes of the isotopes of cobalt on the mass of a mystery lump of the element.

# Drug Stabiliser

##### Stage: 5 Challenge Level:
The maths for half-life of drugs is identical to that for radioactive decay.

Make a table of days against tablets and each day add up the remaining levels for all drugs taken thus far. Thus, on the $n$th day there will be the effect from $n$ tablets to add up. You should do this numerically.