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Let x be Kate's age. In 4 years, 3 times her age is 57

So first , in 4 years, she will be x+4 years old

Now 3 times that is 3(x+4)= 3x+12 and that is 57

so 3x+12=57 or

3x=57-12=45

x=45/3=15

So she is 15 years old

Let's check. In 4 years she is 19 and 19 times 3 is 57.

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