1/3-3/20
Let's evaluate: 13 -320
20 -3×33×20
ℹ-3×3 = -9‖3×20 = 60
20 -960
ℹ20 -9 = 11
▶Result:   1160
The approximate value of: 1160 is:
▷ ≈ 0.1833