SOLUTION: john is now 4 times as old as his brother sam. in 4 years, john will be twice as old as sam will be then. find their present ages.
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Question 241577: john is now 4 times as old as his brother sam. in 4 years, john will be twice as old as sam will be then. find their present ages.
Answer by College Student(505) (Show Source): You can put this solution on YOUR website!
John is now 4 times as old as his brother Sam, so...
Let Sam = x
Let John = 4x
.
In 4 years, John will be twice as old as Sam will be then. Our equation now becomes: John in 4 years = twice Sam in 4 years
Now solve for x to determine Sam's age.
...this is Sam's age (today)
.
...this is John's age (today)
.
Now let's plug the x value in the original equation to see if it makes sense.
Remember:
...the x value checks!
.
Done!
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