Grandma Olga has 3 daughters and 3 sons.  If all her daughters each have 6 sons, and each of her sons has 5 daughters, how many grandchildren does she have in total?
From her daughters, Olga has 3 x 6 = <<3*6=18>>18 grandsons.
From her sons, she has 3 x 5 = <<3*5=15>>15 granddaughters.
Altogether, Olga has 18 + 15 = <<18+15=33>>33 grandchildren.
#### 33