Question

daca a+b=7 iar b+c=10 aflati a+3b+2c

Answer 1

daca a+b=7, iar b+c=10 atunci a+3b+2c=a+b+2b+2c=7+2(b+c)=7+20=27

Answer 2

a+3b+2c= (a+b)+(b+c)+(b+c)
              = 7+ 10 +10
              = 27