At reference or see Flight Planning Manual MRJT 1 Figure 4.3.5.

The following apply:

Temperature ISA +15°C

Brake release mass 62000kg

Trip time 5hr 20 min

Enter at 5.333hrs .... to ISA +15 .... across to ref line (Im at 5.55 hrs now)

Now to brake release wt curve, now down to MASS 62000kg (interpolate carefully) - across to fuel -  right on 13500kg?

These are fairly standard questions .... always think carefully about the scale, units (eg decimal of hrs v hrs and mins .... sharp pencil ...... and so on!!