Suppose there are x blank sheets of paper.

( 1-2/5)x= 120

3/5x= 120

x=200

So there are 200 colored papers.

200+ 120=320 sheets

A: One ***320.

Analysis: Let "unit 1" be X in this question. According to its meaning, listing equations and solving them are the key.

Tip: If you don't know the unit one in the question (in this question, the white paper is the unit one), set it to X, or use division.

If the question tells you the first unit, use multiplication.

I hope this helps.

Ask again if you don't understand.

People from all walks of life are welcome to comment and criticize.