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Ten years ago Ade's age was half the age of his sister, today Ade is 12yrs old. how old is his sister?​

 Jan 29, 2020
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Ade's age 10 years ago   =    A

        and this was 1/2 the age of his sister   A = 1/2 S

 

 

10 years later   Ade is now  A + 10  =12           substitute in the red equation above

    A + 10 = 12

   1/2 S  + 10 = 12

   S=4    (remember this was 10 years ago)

 

 

       and sister is S + 10   = 4+ 10 = 14 y/o    Sister's age now

 Jan 29, 2020

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