Question 1142863: Leo is five years younger than Mario, and Mario's age is 3 times younger than their dad's. The sum of Leo's and Mario's age is 21. Find all of their ages.
Answer by greenestamps(13200)   (Show Source):
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The sum of Leo's age and Mario's age is 21, and Leo is 5 years younger than Mario. That makes Mario 13 and Leo 8. Use formal algebra if you want to determine that -- or simply find two numbers whose sum is 21 and whose difference is 5.
The rest of the problem can't be answered, because the phrase "...3 times younger than..." has no useful meaning.
We have found that Mario's age is 13. If 13 is "3 times younger than their dad's" age, that means if their dad's age is x, then 13 is equal to x - 3x = -2x. So that would mean -2x = 13, making their dad's age -6.5 -- which of course is nonsense.
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