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Angie is 4 years younger than her sister. in 2 years, angie's sister will be twice as old as angie. how old is angie now?i need an equation for this, and i've come up with several, but none of them seem to be correct.

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Apocrophon
a + 4 = s
2(a+2) = (s+2)
plug in the upper equation into the lower equation

2(a+2) = (a+4+2)
2a+4 = a+6
a+4 = 6
a = 2 years old
McVoRTeX
Angie is 2 years old and angies sister is 6 in 2 years angie will be 4 and angies sister will be 8 the equation is what the other person said.
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