Thread: can't figure out how to do mixture weighted averages

Hi thanks for any help in advance. I can't figure out how to do this problem.
A grocer mixed nuts worth $2.40 a pound with nuts $1.50 a pound. How many pounds of each did he use if there was a mixture of 30 pounds averaging $2.25 a pound?

Originally Posted by chipandtoast

Hi thanks for any help in advance. I can't figure out how to do this problem.
A grocer mixed nuts worth $2.40 a pound with nuts $1.50 a pound. How many pounds of each did he use if there was a mixture of 30 pounds averaging $2.25 a pound?

let x = pounds of the $2.40 nuts

y = pounds of the $1.50 nuts

x + y = 30

2.40x + 1.50y = 30(2.25)

solve the system

Originally Posted by skeeter

let x = pounds of the $2.40 nuts

y = pounds of the $1.50 nuts

x + y = 30

2.40x + 1.50y = 30(2.25)

solve the system

So then what do I do? I had a doctors appointment so I couldn't go to algebra today and this is really confusing to me.

Originally Posted by chipandtoast

So then what do I do? I had a doctors appointment so I couldn't go to algebra today and this is really confusing to me.

go to the links and learn how ...



SYSTEMS OF EQUATIONS in TWO VARIABLES