Wednesday, October 21, 2009

3.9 ex 1 Price solution

Let g = the number of gallons of 100% antifreeze to be added. Make a table.


Units (lb)

Price per Unit

Price

Gourmet cat food

5

$1.75

(5)(1.75)=

$8.75

Cheaper cat food

W

$.50

(w)(.50)

Mixed cat food

5 + w

$1.00

(5+w)(1.00)



8.75 + (w)(.50) = (5 +w)(1.00)

Solve
. . .

W = 7.5


Answer: Jerry should buy 7.5 pounds of cheaper cat food to be mixed with the 5 pounds of gourmet cat food to equal out to $1.00 per pound of cat food.