Răspuns :
a+b+c=519
b+c=119
--------------- - (scazi relatiile)
a=400
a-(b+c)=400-119=281
b+c-19=119-19=100
a+b+c-500=519-500=19
b+c=119
--------------- - (scazi relatiile)
a=400
a-(b+c)=400-119=281
b+c-19=119-19=100
a+b+c-500=519-500=19
a+b+c=519
b+c=119
a=519-119=400
a-(b+c)=400-119=281
b+c-19=119-19=100
a+b+c-500=519-500=19
b+c=119
a=519-119=400
a-(b+c)=400-119=281
b+c-19=119-19=100
a+b+c-500=519-500=19