Judy‘s mom prepared 30 sandwiches for her friends her mom added chicken breast to 2/5 of the buns how many chicken sandwiches did her mom make?

If Judy‘s mom prepared 30 sandwiches and added chicken breast to 2/5 of the buns, then she made 30*(2/5) = <<30*(2/5)=12>>12 chicken sandwiches. Answer: \boxed{12}.