An internet bookseller charges $6 perpaperback book plus a $3 shipping and handling fee per order.if Mr.Montoya spent $111 on books for his class,how many books did he buy?

Question

anonymous · Answer

this is a bit of hunt and peck method.
each book cost $6 plus the $3 shipping fee.  Keeping this in mind gives a consistent breakdown of expenses.
6 x #of books + 3 x #of books for shipping = 111
so you would substitute and find the answer
6 x 10 + 3 x 10 = NOT ENOUGH 
6 x 15 + 3 x 15 = TOO MUCH
6 x 11-14 + 3 x 11-14 = gives the answer!  
Hope this helps you out

anonymous · Answer

Thank you

anonymous · Answer

if we let the number of books bought by Mr. Montoya be x, then expressing the given information in an equation 6x + 3 = 111 (i.e 6x being the price he would have to pay for all the books he bought and 3 being the shipping fee assuming he placed one order for all of the books)

solving the obtained equation,
6x + 3 =111,  
=6x + 3 - 3 = 111 - 3
=6x = 108, divide both sides of the equation by 6, then 
x = 18
therefore Mr. Montoya bought 18 books

anonymous · Answer

fatma don't forget that it is $3 per order ... 18*3=54  this would undo your solution to the problem

anonymous · Answer

in answering the question i assumed that he placed one order for all of the books plus it is as you said $3 per order, not per book