Answer:
hello the needed diagram is missing attached below is the diagram and the detailed solution 
The tension in BC = 

Step-by-step explanation:
ATTACHED BELOW IS THE DETAILED SOLUTION T THE GIVEN PROBLEM 
Ma = mg - T/ 
 equation 1
 equation 1
Ma = 3T / 
 equation 2
 equation 2 
equate both equations to determine the tension on BC