A boy is 9 years old and his sister is twice as old. When the boy is 22 years old, his sister will be __?__ years old. (Enter numerical values only).

Name: A boy is 9 years old and his sister is twice as old. When the boy is 22 years old, his sister will be __?__ years old. (Enter numerical values only).
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The Answer of A boy is 9 years old and his sister is twice as old. When the boy is 22 years old, his sister will be __?__ years old. (Enter numerical values only).

A Boy Is 9 Years Old and His Sister Is