His sister is thrice as old as he is. The sum of their ages is 24
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Answer:
let her age be 3x
his age is 24
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Answer:
his age =x
then his sister's age =3x
then=x+3x=24
•4x=24
•x=24/4
•x=6
his age =6 and his sister's age =6*3=18
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