Final answer:
Evan's paycheck was $680.
Step-by-step explanation:
To find out how much Evan's paycheck was, we need to add up the amount he used for his cat payment and groceries, and subtract that total from the amount he has left. Let's call his paycheck amount 'x'.
Half of his paycheck for his cat payment is 0.5x, and $125 for groceries is $125.
So, the equation becomes: x - 0.5x - 125 = 215
Combining like terms, we get: 0.5x - 125 = 215
Adding 125 to both sides of the equation, we get: 0.5x = 340
Dividing both sides of the equation by 0.5, we get: x = 680
Therefore, Evan's paycheck was $680.