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2014-05-18T18:09:07+03:00
B/a=4 rest 2⇒ b=4a+2
a+b=67
inlocuim:a+4a+2=67
5a=67-2⇒  5a=65⇒   a=65/5⇒   a=13
b=4a+2=4·13+2=52+2
b=54
c=2a
c=2·13
c=26
d=(b+c)/2=(54+26)/2=80/2
d=40
d-c=40-26=14