8) A and B are together 90 years old. Five years ago, A was thrice as old as B was. Find ages of A and B.
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Let present age of a =x
present age of b=y
five years ago ...
x-5=3y-5
x+y=90
y=90-x
so ...
x-5= 3(90-x)-5= 180-3x-5= 175-3x
4x= 180
x= 90/2=45
y= 45
present age of b=y
five years ago ...
x-5=3y-5
x+y=90
y=90-x
so ...
x-5= 3(90-x)-5= 180-3x-5= 175-3x
4x= 180
x= 90/2=45
y= 45
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