the present age of a brother is five years more than that his sister if the sum of their present ages is 21 years the present age of the sister is
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let the age of sister be X
therefore age of brother is X+5
atq:
X+X+5= 21
2x+5=21
2x=21-5
=16
X=8
therefore age of brother is X+5
atq:
X+X+5= 21
2x+5=21
2x=21-5
=16
X=8
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