Question 1080311
y, Brother
x, Sister


Description:{{{((y-5)+(x-5))/2=35}}}

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{{{(y+x-10)/2=35}}}

{{{y+x-10=70}}}

{{{y+x=80}}}, total of their ages now.


{{{80/2=highlight(40)}}}


Average of will move along with the age of each in the same way.