math
posted by Ray .
There are 25 books in a bookcase. The books in the bookcase are all math, science, and history books. Seven of the books are math books. There are 4 fewer science books than history books. How many science books are in the bookcase?

math 
please help!!
First you need to assign your unknowns
Math Books: 7
History: x
Science Books: x4
Total books: 25
so your equation is going to be
7+x+x4=25
Then you can solve. I hope this help!
Respond to this Question
Similar Questions

algebra
John has 36 books in his locker. He has text books,library books, and telephone books. How many books of each kind does he have if: lib + tel= 2x text books and text + tel = 3x lib books I think it'd be easier to let T,L and B denote … 
math
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
Lan has 6 books for each book he has 2 science books he has 2 animl books how many books does have 
Reading
Rosalind Wiseman books Terra Elan McVoy books Susane Colasanti books Elizabeth Scott books Wendelin Van Draanen books Laura Preble books Piper Banks books Melissa Kantor books Kate Brian books Katie Finn books Pamela Wells books Cathy … 
3rd grade math
There are 30 books in a bookcase. The books in the bookcase are all poetry, history, and art books. Ten of the books are art books. There are 6 fewer poetry books than history books. How many poetry books are in the bookcase? 
Arithmetic
A box in a college bookstore contains books, and each book in the box is a history book, an English book or a science book. If onethird of these books are history books and onesixth are English books, what fraction of the books are … 
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 … 
math
There are 30 books in a bookcase. The books in the case are either math, science ,or history books. Ten of the books are math books. There are 6 fewer science books than history books. How many science books are in the bookcase? 
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? 
Math
You borrow bookcases like the one shown to display 943 books at a book sale. You plan to put 22 books on each shelf. No books on top of the bookcases. A. How many bookcases must you borrow to display all the books?