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Gabriela is 15 years old because she is x years old right now, so in 45 years she would be 4 times her age now, so 4x.

 

Then you set up the equation:

 

x+45=4x

 

3x=45

 

x=15

Let Gabriela be G.

We know that in 45 years plus her current age she will be 4 times as old as now, so 45+G=4G.

If we subtract both sides by G, we get 3G=45 and then divide by 3 so her current age is 15.

-MPS101