I'm applying for a passport and I'm unsure of what to put for this section. It's 160 for a 10 year passport, plus it says there's a 25$ fee. So do I just put 185?
I believe what you're referring to is the fee mentioned here in PPTC 153:
As it says on the form, the $25 fee is included in the $160 application fee. It is not an additional fee. Further down, you can see that if you cancel your application or are refused, then only the $25 portion of the whole $160 is refundable.
So, you want to pay $160.