Lto make a 10-pound mixture of two kinds of candy m&M's cost $1.80 per pound Reese's cost $1.20 per pound how many pounds of each should used if the total 10 lb makes your cost $15.90

Answer 1

15.90/10 = $1.59 per pound for the mixture

1.8x + 1.2(10-x) = 15.9

1.8x-1.2x = 15.9-12 = 3.9

.6x = 3.9

x = 3.9/.6 =3.9(10/6) = 39/6 = 6.5 = 6 1/2 pounds of M&M's

10-x = 3 1/2 pounds of Reese's candy

1.8 is within .21 of 1.59

1.2 is within .39 of 1.59

.39/.21 = 13/7 = 6.5/3.5

the ratio of M&M's to Reese's is 13/7