Example of Age Problem

Find FATHER''s age
Find WILLIAM''s age
Let F=FATHER
Let W=WILLIAM
Given F=W+26
Given 80=F+10+W+10
80=(W+26)+10+W+10   Comment: Substitute W+26 for F in 80=F+10+W+10
Solution W=17  Comment
Solution F=43  Substitute W=17 into F=W+26
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