how many pounds of peanuts worth $.90 per pound must be added to 10 pounds of walnuts worth $.60 a pound to form a mixture worth $.80 per pound?

Answer 1

10(.6) + x(.9) = (10+x)(.8)

6 + .9x = 8 + .8x

.1x = 2

x = 2/.1 = 20

x = 20 pounds of peanuts mixed with 10 pounds of walnuts to get 30 pounds of a mixture

.9 is within .1 of .8

.6 is within .2 of .8'\; .2/.1 = 2

you need twice as much of .9 to get .8. 20/10 = 2