Hi,

*Note:  Sally always  has been (and will be) 10 years younger than Mary

Let x represent Marys age.  then Sally's age would be(x-10)

Ten years ago***

(x-10) = x/2

2(x-10)= x

2x - 20 = x

x = 20  Mary's age 10 year ago(Sally was 10 then)



Presently Mary is now 30 and Sally is 20



checking our answer

10 = 20/2 

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