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

1. ## 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? 2. 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

3. 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.

4. 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 ...

YouTube - Solving Linear Systems of Equations Using Substitution

SYSTEMS OF EQUATIONS in TWO VARIABLES