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Rob is twice as old as Jodie is now. In 10 years, Rob will be 20 years older than Jodie is at that time. How old is Jodi

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Rob is twice as old as Jodie is now. In 10 years, Rob will be 20 years older than Jodie is at that time. How old is Jodi

by Gmat_mission » Sun Oct 25, 2020 11:38 am

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Rob is twice as old as Jodie is now. In 10 years, Rob will be 20 years older than Jodie is at that time. How old is Jodie now?

A. 10
B. 20
C. 30
D. 40
E. 50

Answer: B

Source: Princeton Review
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Re: Rob is twice as old as Jodie is now. In 10 years, Rob will be 20 years older than Jodie is at that time. How old is

by jhavyom » Sun Nov 01, 2020 2:40 am
Gmat_mission wrote: ↑
Sun Oct 25, 2020 11:38 am
 Rob is twice as old as Jodie is now. In 10 years, Rob will be 20 years older than Jodie is at that time. How old is Jodie now?

A. 10
B. 20
C. 30
D. 40
E. 50

Answer: B

Source: Princeton Review
Rob(R) is twice as old as Jodie(J) is now
R = 2J

In 10 years, Rob will be 20 years older than Jodie is at that time
R + 10 = (J+10) + 20
2J + 10 = (J+10) + 20
J = 20
So, R = 40

Option D is the answer.
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Re: Rob is twice as old as Jodie is now. In 10 years, Rob will be 20 years older than Jodie is at that time. How old is

by Scott@TargetTestPrep » Thu Nov 12, 2020 7:35 am
Gmat_mission wrote: ↑
Sun Oct 25, 2020 11:38 am
 Rob is twice as old as Jodie is now. In 10 years, Rob will be 20 years older than Jodie is at that time. How old is Jodie now?

A. 10
B. 20
C. 30
D. 40
E. 50

Answer: B

Solution:

We can let R = Rob’s current age and J = Jodie’s current age and create the equation:

R = 2J

If Rob will be 20 years older than Jodie in 10 years, he must also be 20 years older than she is presently. Thus, we have:

R = J + 20

Substituting, we have:

2J = J + 20

J = 20

Answer: B

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