I'll give you a question, please answer with step-by-step reasoning process.
Bob started out the week with $80. On Monday alone, he spent half the money. On Tuesday, he spent one-fifth of the amount left from Monday. On Wednesday, he spent 3/8ths of the amount left from Tuesday. How much does he have left now?

20
On Monday, he spent half of $80 leaving him with $80 - (1 / 2) * $80 = $40.

On Tuesday, he spent 1 / 5th of $40 leaving $40 - (1 / 5) * 40 = $32.

On Wednesday, he spent 3 / 8ths of $32 leaving $32 - (3 / 8) * $32 = $20.

.

So, the final answer is 20