Ella has the same number of acorns as Frank. Ella has 9 in one hand and 10 in the other hand. Frank has 8 in one hand. how many acorns does frank have in the other hand?

11

Step-by-step explanation:

You have to balance it out. Since Ella has 9 acorns in one hand and 10 in the other and 9+10=19, she has 19 acorns in total. So you have to figure what number would give Frank 19 acorns as well. You can do this by subtracting 8 (the amount he has in one hand) from 19 (the total number of acorns he has). Since 19-8=11, he has 11 acorns in his other hand.