whole number

Question

Janet bought a box of cookies for her friends. if she gives each of them 4 cookies, she will have 4 cookies left. if she gives each of them 5 cookies, she will need 5 more cookies. how many cookies are there in the box?

Answer 1

let x=# of friends

4x+4=5x-5

4+5=5x-4x

9=x

9*4+4=36+4=40 cookies in the box