Required Mathematical Intelligence

Chapter 52 "Cheap" Stationery

The price of a certain stationery is 2 yuan for 3 pieces, 3 yuan for 50 pieces, 4 yuan for [-] pieces, [-] pieces, and [-] pieces, but [-] yuan for [-] pieces.Guess what kind of stationery is this?
[Answer: These are some boards (or fonts) with words such as "five", "ten", "hundred", "thousand", "ten thousand" and "one" written on them.

The price of one piece is 1 yuan, so buying two boards of "five" and "one" is 2 yuan, and buying three boards of "five", "ten" and "one" is 3 yuan...and "five", "ten", "ten thousand" "A" is 3 yuan.If you regard them all as quantity, the quantity varies greatly, but the price is different, especially it is impossible to only 4 yuan for 3 pieces, so you must be good at discovering their commonality, the "units" are the same, five and 50 What's the difference?Therefore, it can be further thought that numbers do not necessarily represent quantity. When the mind is opened, the problem will be easier to solve. ]
(End of this chapter)