At a souvenir shop, Portia bought two T-shirts for $24 and some packages of seashells for $2.95 per package. Her total purchase came to $47.60. How many packages of seashells did she buy?
Explanation: First subtract the amount of shirts from the total purchase, then do the math until the seashells add up to the $47.60 price, and once again subtract the half price from the total price, then you have your answer.