Question

Jana and her friend bought 4 hamburgers, 3 orders of fries, and 2 milk shakes for $3 each. They paid for the food with $20. Which part of the equation represents the total cost of their items? Justify your answer.

c = $20 - (4h + 3f + 6)

A) $20; They paid $20 for the food.
B) (4h + 3f); Find the total cost by adding the price of 4 hamburgers to the price of 3 fries
C) 4h + 3f + 6; Find the total cost by adding the price of 4 hamburgers to the price of 3 fries to the price of 2 milkshakes.
D) c = 20 - (4h + 3f + 6); Find the total cost by subtracting the price of 4 hamburgers to the price of 3 fries to the price of 2 milkshakes.

Answer 1

I believe the correct answer is C

Answer 2

For this case we have the following variables:

h: Cost of each hamburger bought by Jana and her friend

f: Cost of each order of potato chips bought by Jana and her friend

b: Cost of each milkshake

If you bought 4 hamburgers, 3 orders of potatoes and 2 milkshakes, you have a cost of:

`Cost = 4h + 3f + 2b`

It is known that each shake costs $ 3, so
`b =3`$

Substituting we have:

`Cost = 4h + 3f + 2 * 3`

`Cost = 4h + 3f + 6`

Thus, the total cost is given by:

`Cost = 4h + 3f + 6`

Answer:

`Cost = 4h + 3f + 6`

Option C