If he ate 4 of them, but it means he ate 2/5 muffins, 4 muffins = 2/5 muffins You substitute x muffins for how much muffins she baked in all - 2/5* x muffins = 4 2/5 multiply by 2/5 to cross it out. Do the same to the other side. x= 4 *5/2 x = 10 muffins So there were 10 muffins in all
