add the 3 columns separately
20 +30 +2 = 52 degrees
15+41+30 =86 minutes
18 +32 +15 = 65 seconds
since minutes is greater than 60 subtract 60 from 86 and add 1 to the degrees
now you have 52+1 - 53 degrees
and 86-60 = 26 minutes
since seconds is also greater than 60, subtract 60 from 65 and add 1 to the minutes
26+1=27
65-60 = 05 seconds
so the sum is 53 degrees 27 minutes 05 seconds
