Tension force of string

A $3 \ \rm m$ long stick of mass $6 \ \rm kg$ is suspended horizontally from the ceiling by two strings of equal length tied to its two ends. An object of mass $3 \ \rm kg$ is hung on the stick $1 \ \rm m$ from the left end. Find the tension force $F$ in $\rm N$ on the string at the right end.

Gravitational acceleration $g$ is $10 \ \rm m/s^2$ .