Afood store makes a 11-pound mixture of peanuts, almonds, and raisians. the cost of peanuts is $1.50 per pounds, almonds cost $3.00 per pound, and raisins cost $1.50 per pound. the mixture calls for twice as many peanuts as almounds. the total cost of the mixture is $21.00. how much of each ingredient did the store use.