Father's Age y
A Son's Age b
The Other Son's Age s
Follow the written description closely and translate into equations.
Solve the system. FORMING the system of equations is the biggest part of the solution to the given problem description.
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Simpler System,
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Simple substitution for y, OR simply equating expressions for y,
-----------this suggests that I made a mistake, because we usually expect Natural numbers for this kinds of age description exercises. You can keep working with it, or recheck my steps.