Suppose that a nurse needs 10 cc (cubic centimeters) of a 15.5% solution (that is, a solution that is 15.5% ingredient) of a certain medication, which must be obtained by mixing x cc of a 20% solution and y cc of a 5% solution. Write expressions involving x for

(a) y, the amount of 5% solution,

(b) The amount of ingredient in the x cc of 20% solution,

(c) The amount of ingredient in the 5% solution,

(d) The total amount of ingredient in the mixture.