Can you replace the question mark with a number?

What do you get if you combine Potassium, Nickel and Iron?
A KNiFe.

I programmed a pirate game, but users said, the main character looks not enough like a pirate.
There will be a patch soon.

How much room does fungi need to grow?
As mushroom as it takes.

I visited my doctor today, he told me that I’m going deaf.
That was difficult to hear.

One day a housework challenged husband decided to wash his sweatshirt. Seconds after he stepped into the laundry room, he shouted to his wife, “What setting do I use on the washing machine?” “It depends,” she replied. “What does it say on your shirt?”
Proudly he yelled back, “Chicago Bears!”

Where is the best place to sell a used chess set?
At a pawn shop.