Răspuns :
a+b+c=3600
a=2×b
c=a-1500
c=2×b-1500
2b+b+2b-1500=3600
5b=3600+1500
5b=5100
b=5100÷5
b=1020
a=2×1020
a=2040
c=2040-1500
c=540
a=2×b
c=a-1500
c=2×b-1500
2b+b+2b-1500=3600
5b=3600+1500
5b=5100
b=5100÷5
b=1020
a=2×1020
a=2040
c=2040-1500
c=540