How much weight 2 different angled ropes can support

[kdb004]

Homework Statement

The two angled ropes used to support the crate in the figure below an withstand a maximum tension of 1800 N before they break.

What is the largest mass the ropes can support?

picture of the crate and ropes
http://session.masteringphysics.com/problemAsset/1176891/2/ch05.P007.jpgI am unsure of where to start or an equation to even use. help on how to solve it would be greatly appreciated

 

[The legend]

to start draw in the FBD(showing forces) and then post how you worked out... then if you get stuck ..you'll get help.

 

[pongo38]

Have you ever heard of the "parallelogram of forces"?