Ok
c = cans of soups
f = frozen dinners
200c + 400f = 2400
This is because each can of soup holds 200 mg and frozen dinners hold 400 mg
and the total is 2400 mg of sodium
You then want to simplify by 200 giving
c + 2f = 12
And using elimination you get
f = 2
and
c = 8
Therefore there are 2 frozen dinners as well as 8 cans of soup
