Last month, customers at a gift shop bought 40 birthday cards , 19 congratulations cards , 20 holiday cards , and 21 thank you cards. Suppose 125 customers buy greeting cards next month. How many would you expect to buy a birthday card?

Last month customers at a gift shop bought 40 birthday cards 19 congratulations cards 20 holiday cards and 21 thank you cards Suppose 125 customers buy greeting class=