Posted by Rachel on Thursday, January 31, 2013 at 8:47pm.
Peanuts sell for $3.00 per pound. Cashews sell for $6.00 per pound. How many pounds of cashews should be mixed with 12 pounds of peanuts to obtain a mixture that sells for $4.20 per pound?

Math  bobpursley, Thursday, January 31, 2013 at 8:56pm
C*6+12*3=(C+12)4.20

Math  Reiny, Thursday, January 31, 2013 at 8:58pm
amount of cashews  x pounds
amount of peanuts  12x pounds
6x + 3(12x) = 4.2(12)
6x + 36  3x = 50.4
3x = 14.4
x = 4.8
need 4.8 pounds of cashews and 7.2 pounds of peanuts
Proof:
6(4.8) + 3(7.2)
= 50.4
cost per pound = 50.4/12 = 4.2

correction  Math  Reiny, Thursday, January 31, 2013 at 9:00pm
Ignore my solution
Didn't read the question careful enough
go with bobpursley's solution
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