Weigh the mice. Going by the 10-15% concept, their food should be between 12.5g and 18.75g, if each snake is 125g themselves. My littlest guy can easily down an adult mouse.
NOTE!!! - This assumes that your snakes are ball pythons. Since you posted in general herp, and didn't say what kind of snake you have, that information could be entirely wrong. My kingsnake has just almost reached 200g, and he still eats multiple large mouse hoppers - an adult mouse, let alone a large adult, would be too big for him.
Edit - I see from your profile that June appears to be a ball python, so the above measurement scale should be right. I'm no expert - but that's the advice that I've been given, myself, by those far more experienced than I am.
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