Acollege student needs 11 classes that are worth a total of 40 credits in order to complete her degree. the college offers both 4-credit classes and 3-credit classes. how many 4-credit classes does this college student need to complete her degree?

Pranav and molly are selling pies for a school fundraiser. customers can buy blueberry pies and pumpkin pies. pranav sold 6 blueberry pies and 4 pumpkin pies for a total of $106. molly sold 6 blueberry pies and 3 pumpkin pies for a total of $90. find the cost of each of one blueberry pie and one pumpkin pie