Question 1045522
let s be son age,m be mother age and f be father age.

{{{s}}}={{{1/2*m}}}eq 1


{{{f-m=5}}}   eq 2


{{{m+f+s}}}={{{100}}}  eq3



{{{m+f+0.5m}}}={{{100}}}

{{{f+1.5m}}}={{{100}}}

{{{10f+15m}}}={{{1000}}}
{{{15f-15m=75}}}   
{{{25f=1075}}}   
{{{f=43}}}   
from eq2
{{{f-m=5}}}   eq 2

{{{m=f-5}}}   
{{{m=38}}}   

from eq 1
{{{s}}}={{{1/2*m}}}eq 1
{{{s}}}={{{1/2*38}}}
{{{s}}}={{{19}}}
so
son is 19,mom is 38 and father is 43