Answer:
1/8
Explanation:
The relations can be written as ...
... blue = (3/5)×shirt
... sale = (5/8)×blue
... medium = (1/3)×sale
Substituting, we get
... medium = (1/3)×((5/8)×((3/5)×shirt)) = (1·5·3)/(3·8·5) × shirt = (1/8)×shirt
_____
1/8 of the shirts in the shop are medium blue T-shirts on sale.