Ben bought the enormous box of juice shown below. He drinks 450450450 cubic centimeters of juice each day. How many days does it take Ben to drink the box of juice?

we know that

[the volume of a box of juice]=15*10.5*20------> 3150 cm³

then
if 1 day  drinks------------------> 450 cm³
x days-----------------------> 3150 cm³
x=3150/450------> x=7days

the answer is
7 days