Today is Peter's birthday. One year, from today he will be twice as old as he was 9 years ago. How old is Peter today ? Choose the correct choice from the following answers:
A) 25 years
B) 19 years
C) 17 years
D) 23 years
E) 21 years
let Peter's age=x
x+1=2(x-9)
x=19
ANSWER:19 years
<result>B</result>
Today is Peter's birthday. One year, from today he will be twice as old as he was 9 years ago. How old is Peter today ?