It would
have to mean Maximum Take-Off Mass rather than actual.
From the
data given you're a bit restricted. It's going to be the lowest of the given
structural TOM, 72000kg, or the MLM plus the trip fuel, 56000 + 18000 = 74000,
or the MZFM plus all the fuel except the taxy fuel, 48000 + 21600 = 69600.