Outline Mathematics
Word Problems

Billy is twice as old as Sally

Here's a problem to tackle:

Billy is twice as old as Sally was when Billy was as old as Sally is now. And the sum of their ages is 28. How old are they now?

Solution

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Copyright © 1996-2018 Alexander Bogomolny

Solution

Billy is twice as old as Sally was when Billy was as old as Sally is now. And the sum of their ages is 28. How old are they now?

(In the applet below, click on the underlined omitted expressions. See what happens.)

// formulations

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This applet requires Sun's Java VM 2 which your browser may perceive as a popup. Which it is not. If you want to see the applet work, visit Sun's website at https://www.java.com/en/download/index.jsp, download and install Java VM and enjoy the applet.

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Do not forget to check your solution.

References

1. J. A. H. Hunter, Mathematical Brain-Teasers, Dover Publications, 1976

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Copyright © 1996-2018 Alexander Bogomolny