Final answer:
The minimum and maximum amount of money you could have after some spending and saving, starting with around $39 and a variance of $12, would be $27 and $51, respectively.
Step-by-step explanation:
If you initially remember having around $39 in your wallet and this amount can differ by $12, then to find the minimum and maximum amount of money you could have in your wallet, you would need to perform two separate calculations. First, to find the minimum, you would subtract $12 from $39, which gives you $27. This is the least amount you could have. Secondly, to calculate the maximum, you would add $12 to $39, resulting in $51. Therefore, after spending or saving, the money in your wallet could range from $27 to $51.