Question 1049960


{{{a + b + c = 180}}}....eq.1
----------{{{b = 3a}}}....eq.2
----------{{{c = 5a}}}....eq.3
-------------------------


{{{a + b + c = 180}}}....eq.1..........substitute {{{b}}} and {{{c}}}

{{{a + 3a + 5a = 180}}}

{{{9a = 180}}}

{{{a = 180/9}}}

{{{a = 20}}}

----------{{{b = 3a}}}....eq.2...substitute {{{20}}} and for{{{a}}}

----------{{{b = 3*20}}}

----------{{{b = 60}}}


----------{{{c = 5a}}}....eq.3...substitute {{{20}}} and for{{{a}}}

----------{{{c = 5*20}}}

----------{{{c = 100}}}