Question 975081
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Let *[tex \Large x] represent Sara's age.  Then Sanjay is *[tex \Large x\ -\ 2] and Sasha is *[tex \Large x\ -\ 5].  Their total age is 31, so:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ x\ +\ (x\ -\ 2)\ +\ (x\ -\ 5)\ =\ 31]


Hint:  Nothing in the problem as stated demands that the ages be whole number years.  Note that 2/3 of one year is 8 months.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it

*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \