Răspuns :
c × 3 = 16
c = 16 :3 = 5 rest 1 = 5,(3)
f : 3 = 20
f = 20 : 3 = 6 rest 2 = 6,(6)
c = 16 :3 = 5 rest 1 = 5,(3)
f : 3 = 20
f = 20 : 3 = 6 rest 2 = 6,(6)