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a b
---- = ------ = K
b c
sea a>b>c
a-c=15
b=10
teoria :::
b^2=ac
10^2=ac
100/a=c
reemplazando ::
a-c=15
a-100/a=15
(a^2-100)/a=15
a^2-100=15a
a^2-15a-100=0
a -20
a 5
a=20
c=100/20=5
suma::
a+2b+c=20+2(10)+5=45
espero haberte ayudado