SOLUTION: Maria’s age is 20. Her father’s age is 50. In how many years will Maria's father be twice as old as Maria will be?

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Question 1161548: Maria’s age is 20. Her father’s age is 50. In how many years will Maria's father be twice as old as Maria will be?
Found 2 solutions by ikleyn, greenestamps:
Answer by ikleyn(52794) About Me  (Show Source):
You can put this solution on YOUR website!
.

Let x be "in how many years . . . "


Then you have this equation to find x


    2*(20+x) = 50+x.


Simplify it step by step


    40 + 2x = 50 + x

    2x - x = 50 - 40

     x     = 10.


ANSWER.  In 10 years.

Solved.

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There is a bunch of lessons on age word problems
    - Age problems and their solutions
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    - Really intricate age word problems
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    - OVERVIEW of lessons on age problems
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Read them and become an expert in solving age problems.

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The referred lessons are the part of this online textbook under the topic "Age word problems".


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Answer by greenestamps(13200) About Me  (Show Source):
You can put this solution on YOUR website!


An informal solution, using logical reasoning....

The difference in their ages is 50-20 = 30 years.
So her father will be twice as old as she is when she is 30 and he is 60.
Since they are now 20 and 50, that will be 10 years from now.