Salut.
a + b + c + d = 1300
b = d ÷ 4 => d = 4b
a = 2b
a = c ÷ 3 => c = 3a
2b + b + 6b + 4b = 1300
b × (2 + 1 + 6 + 4) = 1300
13b = 1300
b = 1300 ÷ 13
[tex]\boxed{b=100}[/tex]
a = 2b
a = 2 × 100
[tex]\boxed{a=200}[/tex]
c = 3a
c = 3 × 200
[tex]\boxed{c=600}[/tex]
d = 4b
d = 4 × 100
[tex]\boxed{d=400}[/tex]
- Lumberjack25