ok i discover a mistake i have made, i have the x sign for +
so the big dog is 5
the little dog is 4
and the bones are 3
but at the bottom there are only two bones so here they are worth 2
Conclusion in a sum you must first use x for +
so two bones x big dog = 2x5 = 10
- small dog which has 4 as value (10 + 4 = 14)