Afood store makes a 11–pound mixture of peanuts, almonds, and raisins. the cost of peanuts is $1.50 per pound, almonds cost $3.00 per pound, and raisins cost $1.50 per pound. the mixture calls for twice as many peanuts as almonds. the total cost of the mixture is $21.00. how much of each ingredient did the store use?
a. 3lbs peanuts, 6 lbs almonds, 2 lbs raisins
b. 8 lbs peanuts, 1 lb almonds, 2 lbs raisins
c. 6 lbs peanuts, 3 lbs almonds, 2 lbs raisins
d. 8 lbs peanuts, 2 lbs almonds, 1 lbs raisins

Given: 11-pound mixture of peanuts, almonds, and raisins
Cost:
peanuts - 1.5 per pound
almonds - 3 per pound
raisins - 1.5 per pound

mixture:
twice as many peanuts as almond; total cost of mixture is 21.

a + p + r = 11 lbs
a + 2a + r = 11 lbs
3a + r = 11
r = 11 - 3a

1.5(2a) + 3a + 1.5r = 21
3a + 3a + 1.5r = 21
6a + 1.5r = 21
6a + 1.5(11-3a) = 21
6a + 16.5 - 4.5a = 21
6a - 4.5a = 21 - 16.5
1.5a = 4.5
1.5a/1.5 = 4.5/1.5
a = 3

almonds = 3 lbs
peanuts = 2a = 2(3) = 6lbs
raisins = 11 - 3a = 11 - 3(3) = 11 - 9 = 2 lbs

My answer is: C. 6 lbs peanuts, 3 lbs almonds, 2 lbs raisins 

Okay i will add you