I have problems with expressions..

Susan had 24 stamps. She used some to mail letters..

What expression could I write for that?

Also..
Nancy had 23 books. Her dad bought some books and gave Nancy all but 3 of them.

4 answers

1) what about

24-n where n is the number mailed.
2)
23+(b-3) where b is the number of books dad bought.
thank you so much
1) 23-x
2)23(x-3)
MR SPIDER HAS 7 TIMES AS MANY FLIES AS HE DOES BEETLES. ALTOGETHER HE HAS 48. HOW MANY FLIES AND HOW MANY BEATLES DOES MR SPIDER HAVE?