Question

A colony of ants carried away 10 of your muffins. That was 2/5 of all of them! How many are left?

Answer 1

2/5=0.4=40%
If 40%=10 muffins, then 20 muffins=80%
100%-80%=20%
We know that 40%=10 muffin, so 20% out of 10 muffins will be 5.
If 25 muffins was at the beginning, and a colony of ants carried away 10 of them, then 15 muffins are left.