Answer:
10
Explanation:
Mr morton initially had 60 bird houses.
He sold 10 to one store.
So left number of birdhouses = 60 - 10 = 50.
He sold them equally to 5 stores, 
So, each of them will get 
 = 10 bird houses.
 = 10 bird houses.
So,
He sold 10 birdhouses to each of the other 5 stores.