There is 13/4 liter (L) of water in the water tank. From this water tank, 12/5 liter (L) was scooped out and 11/6 liter (L) was put back in. Find how many liters (L) of water are left in the water tank.
13/4 12/5 [OP_SUB] 11/6 [OP_ADD]
var_a = 3.25
var_b = 2.4
var_c = var_a - var_b
var_d = 1.8333333333333333
var_e = var_c + var_d
print('{:.2f}'.format(round(var_e+1e-10,2)))