Answer:
Mr. Yardi  needs to buy 5 packages of pens
Step-by-step explanation:
He needs to buy 57 pens  (19X3 = 57)
57/12 = Â 4.75
He neesd more than 4 packages So he needs to buy 5 packages and it will be 3 pens left so Mr Yardi can also have 3 pens if he wants