Pens in the Box | March 24, 2014

Of the pens in a box, 2/7 of them are red. Of the remaining pens, 1/5 are blue and the rest are black. There are 270 more black pens than blue pens. How many red pens are in the box?

Thank you to Mr. Closson's 5th grade class for sharing your solutions!

 Thank you to the teachers who sent in their solutions, too! :)