Question

A dozen pens selling for $2.65 or 15 pens selling for $3.45?

Answer 1

the first one is the answer

Answer 2

If you are asking which one is the better buy, it would be the 15 pens because if you divide, 2.65/12 and 3.45/15, you would get that the dozen pens would be greater, or more expensive per pen. So 15 pens are the better buy.