###Human: Peggy buys 3 folders, one each in the colors red, green, and blue.  She puts ten sheets of paper in each folder, and then, she puts star-shaped stickers on each sheet of paper.  In the red folder, each sheet of paper gets 3 stickers.  In the green folder, each sheet of paper gets 2 stickers, and in the blue folder, each sheet gets 1 sticker.  What is the total number of stickers Peggy uses?, ### Assistant: For the red folder, 10 sheets of paper get 3 stickers each, for a total of 10*3=30 stickers.
For the green folder, 10 sheets of paper get 2 stickers each, for a total of 10*2=20 stickers.
For the blue folder, 10 sheets of paper get 1 sticker each, for a total of 10*1=10 stickers.
In total, she uses 30+20+10=60 stickers. 
 So the answer is :  60