Math
posted by Beth .
First of all I don't just need the answer I need it explained where a third grader can understand it. I actually know the answer, but I don't know how to explain it to a third grader. ?Doug has 170 stamps in his collection. His first book of stamps has 30 more stamps in it than his second book. How many stamps are in each book? Thanks

Wouldn't first + (first +30) be 170
so two firsts would be 140 so the first would be ....
and the second one 30 more. 
I still don't quite get how you are explaining it. Can you explain in a different way?