Question 1143199
Please help me solve this question: Paul is born on his grandfather's birthday. In how many years will his grandfather be twice as old as Paul?

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If his grandfather turned G years old on his birthday, then in G more years Paul's grandfather will be twice as old:

Now: 
Paul is 0
Grandfather is G

G years into future:
Paul will be G 
Grandfather will be G+G = 2G  (= twice Paul's age)