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Source: Manhattan GMAT
If 3 years ago Jennifer was 22 years old, how old is Carmen now?
(1) 10 years ago, Carmen was twice as old as Jennifer.
(2) 10 years from today, Carmen will be 15 years older than Jennifer.
The OA is D.
$$\text{Let say, } \ J-3 = 22 \Rightarrow\ J=25$$
$$1)\ 2J = C \& 2J+10=C+10,$$ Substituting we can get the value of J & C, SUFFICIENT.
$$2)\ J+10-15=C,$$ Substituting we can get the value of J&C, SUFFICENT.
Hence, D is the correct answer.
If 3 years ago Jennifer was 22 years old, how old is Carmen now?
(1) 10 years ago, Carmen was twice as old as Jennifer.
(2) 10 years from today, Carmen will be 15 years older than Jennifer.
The OA is D.
$$\text{Let say, } \ J-3 = 22 \Rightarrow\ J=25$$
$$1)\ 2J = C \& 2J+10=C+10,$$ Substituting we can get the value of J & C, SUFFICIENT.
$$2)\ J+10-15=C,$$ Substituting we can get the value of J&C, SUFFICENT.
Hence, D is the correct answer.
