Question 1180691
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Hi
John is nine years old than his sister,Elizabeth. 
Let x be Elizabeth's age
John (x+9)
Question States:
sum of their ages is 65
(x+9) + x = 65
    2x = 56
     x = 28, Elizabeth's age.   John is 37.  {{{28 + 9}}}

28 + 37 = 65 checks
Wish You the Best in your Studies.
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