If a “sample” of pennies contained 75 heads and 25 tails, how many half‐lives would have passed since the “sample” formed. Explain your answer.
If a “sample” of pennies contained 25 heads and 75 tails, how many half‐lives would have passed since the “sample” formed. Explain your answer.

Please help, our teacher teaches nothing and we get random work with no context! This is the only question our whole (honors) class doesn't understand.