Question

Mos craciun are 3 turme de reni . In prima si a doua sunt  225 reni ,  in a doua si a treia sunt 500 reni , iar in prima si a treia sunt 500 reni , iar in  prima si a treia sunt 305  reni . Cati reni are Mosu' in turma mai numeroasa ?

Answer 1

a+b=225
b+c=500
a+c=305
2a+2b+2c=1030
2(a+b+c)=1030
a+b+c=1030:2=515
a+b=225
c=515-225
c=290
a+c=305
b=515-305
b=210
a+c=305
a+285=305
a=305-290
a=15

15+210+290=515

Answer 2

a+b=225
b+c=500
a+c=305
a+b+b+c+a+c=225+500+305
2(a+b+c)=1030
a+b+c=1030:2=515
inlocuim a+b
225+c=515
c=515-225=290
inlocuim b+c
a+500=515
a=515-500=15
inlocuim a+c
b+305=515
b=515-305=210
proba :210+15+290=515