SOLUTION: If, in 7 years, Susan will be 2 times as old as she was 3 years ago, what is Susan’s present age?

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Question 1081988: If, in 7 years, Susan will be 2 times as old as she was 3 years ago, what is Susan’s present age?
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

let Susan’s present age be: x
in 7 years, Susan will be: x%2B7
3 years ago she was:x-3
and if x%2B7 will be 2 times x-3%7D%7D%2C+we+have%0D%0A%0D%0A%7B%7B%7Bx%2B7=2%28x-3%29.........solve for x
x%2B7=2x-6
6%2B7=2x-x
13=x
so, Susan’s present age is 13

check:
present age is 13
in 7 years, Susan will be: 20
3 years ago she was:10
20=2%2810%29
20=20.........which confirms our result