# math

posted by .

lara arranged the books in her bookshelf by size. 2/10 of the books were tall and 1/2 of the books were medeium sized. If 12 of the books were small, how manyu total books did she arrange?

• math -

2/10 + 5/10 = 7/10

(3/10)x = 12
x = 12/(3/10)
x = 12 * (10/3)
x = 120/3
x = ?

• math -

could you please explain how you got 5/10 and 3/10?

• math -

1/2 = 5/10

10/10 - 7/10 = 3/10

## Similar Questions

1. ### College Math

Your small library of books consists of 6 novels, 7 mathematics books, and 1 biology book. Calculate the number of ways to arrange them on a bookshelf for each of these situations. a) The books can be arranged in any order?
2. ### math

Stan wants to arrange his books in order of size. Half of the books are medium, 2/10 are large and 12 are small. What is the total number of books Stan has?
3. ### Math

John has 4 math books, 6 biology books,, and 8 statistics books to arrange on a shelf. In how many ways can he arrange the books so that books on the same subject are grouped together?
4. ### MATHS

Mrs.Koh purchased new books for the school library, of which 6 were Mathematics books, 7 were Science books, 10 were Music books, 3 were Art books, and 4 were social studies books. All of these books were different. She picked a book …
5. ### math

A student has 4 English books,3 math books,and 5 history books.In how many ways can these books be arranged on a shelf if the books in same subjects must be kept together?
6. ### Math

Emily has 85 books on her bookshelf. Of those books, 20% are mysteries, 18 are adventure stories, and the rest are fantasies. What is the simplified ratio of fantasies to total books on her bookshelf (i got 10:17 ) answers list:35:50 …
7. ### discrete math

Q6:What if the bookshelf is circular, that means you cannot choose the first and last books simultaneously?
8. ### discrete math

Q6:What if the bookshelf is circular, that means you cannot choose the first and last books simultaneously?
9. ### math

Lara arranged the books in her bookshelf by size she arranged 2/10 of the books were tall and 1/2 of the books were medium sized. if 12 of the books were small, how many total books did she arrange?
10. ### discrete math

Q6:What if the bookshelf is circular, that means you cannot choose the first and last books simultaneously?

More Similar Questions