Răspuns:
a = 52 ml
Explicație pas cu pas:
a + b = 107 ml cerneala
a - 19 ml = b - 22 ml =>
a = b -22 +19 => a = b - 3 ml
b - 3 ml + b = 107 ml =>
2b = 107 ml + 3 ml =>
2b = 110 ml =>
b = 110 ml : 2 => b = 55 ml
a = 107 - b =>
a = 107 ml - 55 ml =>
a = 52 ml
#copaceibrainly
