Question 83367
a boy is five years older than his sister. if the sum of their ages is 31. how old is each now?
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Let sister's age be "x" ; boy's age is "x+5". 
EQUATION:
x + x+5 = 31
2x=26
x=13 yrs old
x+5 = 18 yrs old
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Cheers,
Stan H.