The present age of huang is [tex]9[/tex] years. or now he is [tex]9[/tex] years old.
Age is the length of time that a person has lived.
Present age is the real age, it tells how old the person is now.
In seven years mean after seven years.
Last year is the previous year of present age.
In seven years, huang will be two times as old as he was last year.
Let the present age of huang be [tex]x[/tex]
After seven year huang age will be [tex]x+7------1[/tex]
It is given that, two times as old as he was last year [tex]2(x-1)------2[/tex]
These both quantity are given to be equal.
So equating both equation,
[tex]x+7=2(x-1)\\x+7=2x-2\\2x-x=7+2\\x=9[/tex]
Hence, the present age of huang is [tex]9[/tex] years. or now he is [tex]9[/tex] years old
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