Enter
at 2800nm - to the WIND REF line ... adjust to 15kt head wind ...make a pencil
mark ...vertically up to 35000ft (interpolate between 33 & 37) ... across
to the LANDING WEIGHT REF LINE.
Now
adjust to the 50000kg LANDING WEIGHT condition (use the dashed line, this is
37000ft, close enough to 35000ft!).
From
the 50000 kg condition, read the scale - should have 17800kg!