Answer
$55^\circ 9'$
Work Step by Step
In this kind of substraction, we substract the degrees from the degrees and the minutes from the minutes:
$180^\circ$ can be rewritten as: $179^\circ 60'$
$179^\circ 60'-124^\circ 51'=(179-124)^\circ+(60-51)'=55^\circ 9'$
