Question

A box contains blue red and green pens. 25% of the pens are green and 35% are red. 48 blue pens cannot be used but the remaining 40% of the blue pens are usable. How many blue pens are there? How many pens are there altogether?

Answer 1

40% are blue
of those 60% are unusable , 40% usable

--> 48 is 60% of 40% of X
--> 48 = (.6)(.4)X
X = 48/.24 = 200

40% of 200 = 80