Question

Of the black and blue pens in the desk, 18 are black. The ratio of black pens to blue pens is 2:3. Remove 3 pens, what is the new ratio of black pens to blue pens?

Answer 1

2:3 = 18:x
so, x=27, the no. of blue pens.

Now, you have to decide the color(s) of the 3 pens removed to figure the new ratio.