Sandro has six times as many daughters as sons. If he currently has three sons, how many children does he have?
If Sandro has three sons, the total number of daughters, six times the number of sons, is 3 sons * 6 daughters/son = <<3*6=18>>18 daughters.
The total number of children is 18 daughters + 3 sons = <<18+3=21>>21 children.
#### 21