Question

a+b+c=100 a+b=50 b+c=70 a=? b=? c=?

Answer 1

c=100-50=50
a=100-70=30
b=50-30=20
sau
b=70-50=20

Answer 2

a+b+c=100, a+b=50 => c=100-50=50
a+b+c=100, b+c=70 => a= 100-70=30
a+b= 50, a=30 => b= 50-30= 20

R: a=30, b=20, c=50