Posted by **Jim** on Monday, September 14, 2009 at 12:05am.

If cashews cost $5.00 per pound and peanuts cost $1.50 per pound how do I write the formula to determine how many pound of cashews to mix with 30 pound of peanuts so that the mix will sell for $3.00 per pound.

- college -
**DrBob222**, Monday, September 14, 2009 at 12:37am
Let C = weight cashews.

30(1.50) + 5.00*C = (30+C)(3.00)

- college -
**drwls**, Monday, September 14, 2009 at 12:39am
Let C be the # of pounds of cashews and 30 be the # of pounds of peanuts.

$3 times the total number of lb. equals the sum of the costs of separate purchases of peanuts and cashews.

(C + 30)* 3 = 5 C + 1.50*30 = 5C + 45

Solve for C

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