>>11535407>>11535106>>11535130>>11535132>>11535257>>11535484Look more carefully. In the first row, the witches are holding wands and brooms. In the last row, the witch is empty-handed.
wand = 7
broom= 4
witch holding wand and broom = 15
Thus
witch empty handed = witch holding wand and broom - wand - broom = 15 - 4-7 = 4
Thus
broom + witch*wand = 4 + 4*7 = 4 + 28 = 31.999999...