Triangle xyz equals triangle d e f, yz is 10 m x z is 15 m in e f is 8 meters what is df

By similarity of triangles we have the following relationship:
 (YZ) / (XZ) = (ef) / (df)
 Substituting values we have:
 (10) / (15) = (8) / (df)
 Clearing we have:
 df = (15/10) * (8)
 df = 12 meters
 
 The value of DF is given by:
 df = 12 meters

8doors on the second floor

Idon’t exactly understand but i think dbc=rst