Please help with this math problem: Two soft drinks and an order of french fries cost $5.00, at a football game. . . . . . . . . . . . . . . . .Sam ordered a soft drink and an order of fries for...

Please help with this math problem: Two soft drinks and an order of french fries cost $5.00, at a football game. . . . . . . . . . . . . . . . .

Sam ordered a soft drink and an order of fries for himself and the same for Sally. If Sam paid $7.00, what is the price of a soft drink?

Expert Answers
pohnpei397 eNotes educator| Certified Educator

The answer here is that a soft drink costs $1.50 and fries cost $2.  Here is how you can get that answer:

Let's let S be soda and F be fries.

We know that 2S + F = 5 because of your first statement.  Because of your second statement, we know that 2S + 2F = 7.

So now we can substitute.  In the first equation, let's find for F.  F = 5 - 2S.

Now we can plug that into the second equation and we now have

2S + 2 (5 - 2S) = 7

2S + 10 - 4S = 7

-2S = -3

S = 1.5

Now we plug this value for S back into one of the equations.

3 + F = 5

F = 2

krishna-agrawala | Student

Cost of 2 soft drinks and one french fries is $5.

Th cost of 2 soft drinks and 2 french fries purchased by Sam for himself and Sally is $5.

Let us say:

Cost per soft drink = s

Cost per french fries = f

Then from the information given on cost of the above two orders we can formulate following 2 simultaneous equation.

2s + f = 5     ...   (1)

2s + 2f = 7   ...   (2)

Subtracting equation (2) from equation (1) we get:

2s - 2s + 2f - f = 7 - 5

f = 2

Substituting this value of f in equation 2 we get:

2s + 2 = 5

2f = 5 - 2 = 3

Therefor:

f = 3/2 = 1.5

Answer:

Price of soft drink = $1.5

Price of french fries = $2

neela | Student

Two soft drink and a French fry cost $5

2 soft drink and two fries    cost Rs 7. Therefore  The second order has an extra fry which costed  $(7-7) = $2 more than the former. Therefore a fry cost $2. That implies Ot of $ dollars for the 2nd order he pays $4 for the two fries and 3 dollars for the two soft drink. So the rate of one soft drink is $3/2 = $1.5. This checks well with the first (likel) order the 2 soft drinks costing $3 and a fry costing $2, the total being $5