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age problem with fraction

Sagot :

Hmm...

What about:

Johnny was 2 and a half years old [tex]( 2\frac{1}{2} )[/tex]. His sister, Rebecca, was 8 and two thirds old [tex](8 \frac{2}{3} )[/tex].

What is their age difference, from Rebecca to Johnny? What is the sum of their ages?