Question:
A box contained red and blue pens. After another 60 red pens were added to the box, the percentage of red pens increased from 30% to 45%. How many blue pens were there in the box?
Empowering Students and Parents with Solutions
A box contained red and blue pens. After another 60 red pens were added to the box, the percentage of red pens increased from 30% to 45%. How many blue pens were there in the box?