18 11/15 + 1 4/15
⚠ 18 11/15 is read as the mixed number 18 + 11/15
⚠ 1 4/15 is read as the mixed number 1 + 4/15
Let's calculate: 18 + 1115 + 1 + 415
ℹ18 + 1 = 19‖1115 + 415 = 11 + 415
19 + 11 + 415
ℹ11 + 4 = 15
19 + 1515
ℹ1515 = 1
19 + 1
▶Result:   20