Respuesta :
the third number is 22 because 30 plus 20 is 50 and than subtract 72 from 50
2×10 + 3×10 = 50= 20 + 30
so then we can subtract 50 from 72
50 - 72= 22 so the other number is 22
so then we can subtract 50 from 72
50 - 72= 22 so the other number is 22