Question 387844
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Hi,         
Let x and 3x represent Emily's and Katie's age now respectively
IN 10 years...***
 3x+10 = 2(x+10)
solving for x
 3x+10 = 2x + 20
   x = 10, Emily's age NOW.  Katie is now 30

CHECKING our Answer***
 40 = 2*20