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.

# Answer

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Question:
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?
Answer:
Let's think step by step.

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33
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?
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