Maths moments question

The question:
Find the total moment of two equal and opposite forces of 25 N acting on a corkscrew, along lines 10 cm apart?

I got 0 but it says its incorrect,
With the given information if the magnitude of the forces are equal and the distance is symmetrical how can the answer not be 0. I'm new to moments so might be a basic mistake

You add moments clockwise/anticlockwise not linearly. What you probably have is a couple
https://physicsnet.co.uk/a-level-physics-as-a2/mechanics/moments/
so (probably) add the two moments

so in this case it would be 2.5+2.5= 5NM which I tried and it said its also incorrect

so in this case it would be 2.5+2.5= 5NM which I tried and it said its also incorrect

The correct answer was 2.5 unsure why as that's only accounting for the moment of one force and it asks for total moment