CLICK! Looks like the 777-300ER has a MTOW 50 tonnes higher than the 777-300! The 777-300 has the same take off weight as the 777-200ER, which in turn has a MTOW 50 tonnes higher than the 777-200. The 777-200LR has a weight 4 tonnes lower than the 777-300 ER.
If you know the 777-300 has a MTOW of 297 tonnes, can you calculate every MTOW? :D.