A candy store makes an 8-pound mixture of gummy candy (g), jelly beans (j), and hard candy (h). The cost of gummy candy is $2.00 per pound, jelly beans cost $3.00 per pound, and hard candy costs $3.00 per pound. The mixture calls for four times as many gummy candy pieces as jelly beans. The total cost of the mixture is $20.00.

"How many lbs of each ingredient did the store use?"

1 answer

Let's assume that the weight of gummy candy (g) is x pounds.

According to the given information, the weight of jelly beans (j) would be x/4 pounds.

Since the total weight of the mixture is 8 pounds, we can create the equation:

x + x/4 + h = 8

Multiplying the equation by 4 to get rid of the fraction:

4x + x + 4h = 32

Combining like terms:

5x + 4h = 32

We also know that the cost of gummy candy (2x), jelly beans (3(x/4)), and hard candy (3h) adds up to $20.00.

So we can create a second equation:

2x + 3(x/4) + 3h = 20

Multiplying the equation by 4 to get rid of the fraction:

8x + 3x + 12h = 80

Combining like terms:

11x + 12h = 80

Now we have a system of equations:

5x + 4h = 32
11x + 12h = 80

To solve this system, we can use the method of substitution.

From the first equation:

4h = 32 - 5x

Dividing by 4:

h = (32 - 5x)/4

Substituting this value of h into the second equation:

11x + 12((32 - 5x)/4) = 80

Multiplying by 4 to get rid of the fraction:

44x + 12(32 - 5x) = 320

Expanding the expression:

44x + 384 - 60x = 320

Combining like terms:

-16x = -64

Dividing by -16:

x = 4

Substituting this value of x back into the first equation:

5(4) + 4h = 32

20 + 4h = 32

4h = 12

h = 3

Therefore, the candy store used 4 pounds of gummy candy, 1 pound of jelly beans, and 3 pounds of hard candy in the mixture.