Question

Question #f1ddd

Answer 1

This means the sum of the numbers is `5(x-1)`

Explanation:

`->1+5+x+10+15=5(x-1)`

`->31+x=5x-5`

(add 5, subtract x on both sides)
`->31+5+cancelx-cancelx=5x-x-cancel5+cancel5`

`->36=4x->x=9`

Check :
`mean=(1+5+9+10+15)/5=40/5=8=9-1` Check!