How would I put this word problem into a system of equations (three equations)? Once its in equation form I can easily solve it...

Question

A natural food store makes its own brand of trail mix out of dried apples, raisins, and peanuts. One pound of the mixture costs $3.18. It contains twice as much peanuts by weight of apples. One pound of dried apples costs $4.48, a pound of raisins $2.40, and a pound of peanuts $3.44. How many ounces of each ingredient are contained in 1 pound of the trail mix?

Answer 1

Let A,R, and P represent the fraction of apples, raisins, and peanuts.

P=2A
4.48A+2.40R+3.44P = 3.18
A+R+P=1

Solve for A, R and P (must each be >0).

Answer 2

I need help