There are 160 books in Class A and Class B. If 20 books are taken from Class A to Class B, the ratio of books in Class A and Class B is 1:3. How many books are there in Class A?

A and B books 160. If 20 books are taken from Class A to Class B, the ratio of books in Class A and Class B is 1:3, and the books in Class A now account for1(1+3) =1/4 of the total.

So A now has 160× 1/4 = 40 copies.

A originally had 40+20=60 copies.

Kindergarten slogan _ kindergarten propaganda slogan

Brief introduction of Muzawa Tatsuya

Where is the fun in Wu Hanyou?

What is ceramic art?

Knowledge points about interpretation

What fire extinguisher is used in the library fire?

Why is China Communication University called "Haidilao University"?

What sounds are noise in the surrounding environment of the school and in daily life?

Indesign typesetting and printing books, according to the size of the layout, what are the font size and line height of the text respectively?

I want to know which "all-in-one-card" libraries are available in Beijing Public Library. Specific location