There are only blue pens, green pens and red pens in a box.
SMARTEST ONLY! BRAINLY
The ratio of the number of blue pens to the number of green pens is 2 : 5
The ratio of the number of green pens to the number of red pens is 4 : 1

There are less than 100 pens in the box.

What is the greatest possible number of red pens in the box?