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Jack is buying groceries. He decides to buy 50 total frozen entrees. He buys nothing but Burritos andHungry-Man Meals. The average price of a Hungry-Man Meal is $3.25 while the average price of a Burritois $2.00. If he spends $150 on all the frozen food, how many Hungry-Man Meals and Burritos did he buy?

Sagot :

Let x the total of Hungry-Man Meals bought.

let y the total of burritos bought.

He decides to buy 50 total frozen entrees.

x + y = 50

If we solve the equation for x

x = 50 - y

We also know that he spends $150 on all the frozen food.

Therefore:

x Hungry-Man Meals for $3.25

y burritos for $2.00

x(3.25) + y(2.00) = 150

3.25x + 2.00y = 150

Now substituting 50-y from the first equation into the second equation and solve for y:

3.25x + 2.00y = 150

3.25(50-y) + 2.00y = 150

3.25*50 - 3.25*y + 2.00y = 150

162.5 - 3.25y + 2.00y = 150

162.5 - 1.25y = 150

Subtract both sides by 150

162.5 - 150 - 1.25y = 150-150

12.5 -1.25y = 0

Add both sides 1.25y

12.5 -1.25y+1.25y= 0+1.25y

12.5 +0 = 1.25y

Divide both sides by 1.25

12.5/1.25 = 1.25y/1.25

10 = y

Substitute 10 for y in the result of the x equation:

x = 50 - y

x = 50- 10

x = 40

So 40 Hungry-Man meals and 10 burritos Jack bought.