Question 1141879
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Since the ratio of the two ages is 4:3, let the two ages be 4x and 3x.<br>
In virtually all problems where a ratio is given, that is a good way to start on the problem.<br>
The problem tells us that the difference in their ages is 3 years.  But the difference in their ages is 4x-3x = x; so x=3.<br>
And that makes the ages of the two sisters 4x=12 and 3x=9.