Question

1. A food factory produces trail mix containing raisins and cashews at a cost of $9 per pound. Every 3-pound container of trail mix contains r pounds of raisins and c pounds of cashews. The factory purchases raisins at $4 per pound and cashews at $8 per pound.

*Choices*
A. 4r+8c=9
B.r+c=3
C.4r+8c=27
D.r+c=9
I choose D, not sure on it though

Answer 1

consider that 3 lbs will cost $27 at $9/lb
so, adding up the value of the raisins and cashews in a 3lb bag,
4r+8c = 27