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1. The age of the sister will be 20 years when the boy’s age will be 12 years, given that when the boy was 8 years old, his sister was twice as old as him.

   In the question, we are given that a boy is 8 years old and his sister is twice as old.

   We are asked to find the age of the sister, when the boy is 12 years old.

   The given age of the boy = 8 years.

   Thus, the age of the sister = Twice the age of the boy = 2*8 years = 16 years.

   The given case is when the boy is 12 years old.

   Thus, the increase in the age of the boy = 12 – 8 = 4 years.

   The age of the sister, after increasing 4 years = 16 + 4 = 20 years.

   Thus, the age of the sister will be 20 years when the boy’s age will be 12 years, given that when the boy was 8 years old, his sister was twice as old as him.

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