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Barney & Fred

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Barney & Fred

Postby nycmath » Fri Sep 11, 2026 6:48 am

Fred is 4 years older than Barney. Five years ago the sum of their ages was 48. Find their current age.
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Re: Barney & Fred

Postby Eigenvalue » Fri Sep 11, 2026 6:15 pm

Here is my work for the question:
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Re: Barney & Fred

Postby Eigenvalue » Fri Sep 11, 2026 6:19 pm

Another feasible method:
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Re: Barney & Fred

Postby nycmath » Fri Sep 11, 2026 8:39 pm

Eigenvalue wrote:Another feasible method:


The matrix algebra method is interesting but a bit more challenging. I haven't played with matrix algebra in more than 10 years. So, I'm a bit rusty. We will get there later in the Sullivan textbook.

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