Question

a+b=174 b=a:2+21 a=? b= ?

Answer 1

a+b = 174
b = a:2+21 = >a:2 = b-21 =>a =( b-21)×2 = >
=> a = 2b-42

a |______|______|-42
b |______|

avem 3 segmente egale -42 = 174
174+42 = 216
216:3 = 72 ( un segment)
a = 2×72-42 = 144-42 = 102
b = 72

Verificare:
102 + 72 = 174
72 = 102:2+21
72 = 72

a = 102
b = 72