[tex]a,b,c,d-nr.[/tex]
[tex]a + b + c + d = 923[/tex]
[tex]a = \frac{b}{4} [/tex]
[tex]b = 4a[/tex]
[tex]a = \frac{c}{2} [/tex]
[tex]c = 2a[/tex]
[tex]d = a - 13[/tex]
[tex]a + 4a + 2a + a - 13 = 923[/tex]
[tex]a + 4a + 2a + a = 923 + 13[/tex]
[tex]8a = 936[/tex]
[tex]a = \frac{936}{8} [/tex]
[tex]a = 117[/tex]
[tex]b = 4a[/tex]
[tex]b = 4 \times 117[/tex]
[tex]b = 468[/tex]
[tex]c = 2a[/tex]
[tex]c = 2 \times 117[/tex]
[tex]c = 234[/tex]
[tex]d = a - 13[/tex]
[tex]d = 117 - 13[/tex]
[tex]d = 104[/tex]
