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Jack and His Sister

Jack is 16 and his sister is 10. How many years ago was Jack three times older than his sister?

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Sagot :

Final answer:

Seven years ago, Jack was three times older than his sister.


Explanation:

Jack is 16 and his sister is 10. Let x be the number of years ago when Jack was three times older than his sister.
Equation based on the given information: 16 - x = 3(10 - x)
Solving the equation: 16 - x = 30 - 3x ==> 2x = 14 ==> x = 7 years ago.
Therefore, 7 years ago, Jack was three times older than his sister.


Learn more about Mathematical problem-solving here:

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