Jack bakes cookies for the class party but got hungry and ate half before going on his way there he bought another dozen cookies from the blizzard bakery to bring how many cookies did jack bake if he brought 30 cookies to the party

Step-by-step explanation:

As he brought 30 cookies,

working backwards,

30-12 = 18 (cookies he had before buying from the bakery)

18*2=36 (because he ate half of it, so 18 would be the number of cookies he had left after eating half, so double it)

therefore, jack baked 36 cookies