Question

A grocery store sells a store-made brand of raisin bran in bulk (by the pound). The store sells this mixture for $3.14 per pound. When the store mixes its raisin bran, the employees use raisins that are $4.50 per pound and bran flakes that are $2.80 per pound. If the store makes 50 pounds of raisin bran, how many pounds or raisins and bran flakes does the store need?

Answer 1

Answer: quantity of raisins = 10 pounds, quantity of bran flakes = 40pounds.

Explanation:

Let r= quantity of raisins, b = quantity of bran flakes.

As per given,

r+b=50 (i)

4.50r + 2.80b= 3.14(50)

⇒4.50r + 2.80b=157 (ii)

Multiply (i) by 2.80, we get

2.80r+2.80b=140 (iii)

Now, subtract (iii) from (ii), we get

1.7r = 17

⇒ r= 10

Put this in (1), we get

`10+b=50\Rightarrow\ b= 40`

Hence, quantity of raisins = 10 pounds, quantity of bran flakes = 40pounds.