What is the answer for one half plus seven ethes plus three tents?

Assuming that
ethes is actually meant to be eighths
and
tents is meant to be tenths,
then

1/2 + 7/8 + 3/10 = 20/40 + 35/40 + 12/40 = 67/40 or 1.675
Assuming that
ethes is actually meant to be eighths
and
tents is meant to be tenths,
then

1/2 + 7/8 + 3/10 = 20/40 + 35/40 + 12/40 = 67/40 or 1.675