SOLUTION: Bob's father is 3 times old as Bob. 4 years ago, he was 4 times older. How old is Bob?

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Question 941572: Bob's father is 3 times old as Bob. 4 years ago, he was 4 times older. How old is Bob?
Answer by srinivas.g(540) About Me  (Show Source):
You can put this solution on YOUR website!
let present age of bob be x years
bob's father = 3times bob's age
= 3x
4 years ago, age of bob = x-4
4 years ago, age of father = 3x-4
4 years afo father's age = 34 times bob's age
3x-4 =4(x-4)
3x-4 = 4x-16
16+3x-4= 4x
12 +3x=4x
12 = 4x-3x
12 =x
Result: age of bob(x)= 12 years