Diego bought some raisins and walnuts to make trail mix. trail mix.PNG Raisins cost $4 a pound and walnuts cost $8 a pound. Diego spent $15 on both ingredients.

Question

Look at the 4 scenarios below and decide if Diego could have bought that with his $15. Explain how you figured it out.  

1) 4 pounds of raisins and 2 pounds of walnuts 

2) 1 pound of raisins and 1.5 pounds of walnuts 

 3) 2.25 pounds of raisins and 0.75 pound of walnuts 

 4) 3.5 pounds of raisins and 1 pounds of walnuts 

 

Answer 1

Well if r is lbs of raisins and w lbs of walnuts, total cost = 4r + 8w <= 15

4r + 8w.

(1) 32

(2) 16

(3) 15

(4) 22

so answer (3)

Mike