Question

Samuel has some erasers. if he packs them into boxes of 6, he will have 4 extra erasers. if he packs them into boxes of 9, he will be short of 5 erasers. what is the minimum number of erasers Samuel has?

Answer 1

22erasers
let the number of boxes be =x
then
x*6+4=x*9-5
6x+4=9x-5
4+5=9x-6x
9=3x
x=9/3=3

now 3*6+4=22