we are given
total number of students =23
the additional number of cookies =x
you have baked 12 cookies
so, total number of cookies =x+12
the additional number x of cookies you need to bake in order to have 2 cookies for each student
so, we can find total number of cookies
total number of cookies = ( total number of students)*(cookies each student)
so, we can plug values
total number of cookies = ( 23)*(2)
total number of cookies = 23*2
so, we can set them equal

we can divide both sides by 23

so, the equation is :

now, we can solve for x
Subtract both sides by 12


so,
the additional number of cookies is 34..........Answer