Answer:
n=m(x)
Explanation:
n is the dependent variable m is the independent variable.
how many cartons, depends on how many liters are in a carton.
how many he needs to buy= the amount in carton× how ever much is in his recipe
for example
if they're are let's say 1.5 liters per carton than m=1.5. and if he needs 15 liters than n= 15
than the equation is

x is how many cartons he needs to buy
solve for x by dividing both sides of the equation by 1.5

and x=10 in this scenario