Solve the question mark (?). Represent x as the value of the question mark
(-1) (-2) (x) (-4) (-5) = -120
(2) (x) (20) = -120
40x = -120
(shaded 40)x / (shaded 40) = -120/40
x = -3
Check:
(-1) (-2) (-3) (-4) (-5) = -120
(2) (-3) (-4) (-5) = -120
(-6) (-4) (-5) = -120
(24) (-5) = -120
The missing number is -3