SOLUTION: Father is 5 time older then son.in 15 years father will be twice as older then son how old Father at present age. (its answer is 25 years) how it comes? help me ...

Question 666553: Father is 5 time older then son.in 15 years father will be twice as older then son how old Father at present age. (its answer is 25 years) how it comes? help me ...
Answer by ReadingBoosters(3246) (Show Source): You can put this solution on YOUR website!
Establish variables
x = father
y = son
...
Given
x = 5y
x = 2y + 15
...
Plug in the value of x into the second equation
5y = 2y + 15
Group like terms
5y - 2y = 15
3y = 15
y = 5
...
If son is 5, then father, x is 5(5) = 25
.....................
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