You can put this solution on YOUR website!
Let the cost of one lb. of sweet potatoes = s
Let the cost of one lb. of apples = a
Let the cost of one lb. of onions = n (I chose n to represent onions so that there is no possibility that o ("oh") can be confused with 0 ("zero").
Since the only given constant value was expressed in cents, the value of
must also be in cents. Hence, onions cost 12 cents per pound.
Apples, then, must cost
cents per pound and sweet potatoes cost
cents per pound.
Either this is a VERY old problem, or I want to know where to find this grocery store!