diff --git a/NUCE_2113/quick_maths.py b/NUCE_2113/quick_maths.py
new file mode 100644
index 0000000..90521c0
--- /dev/null
+++ b/NUCE_2113/quick_maths.py
@@ -0,0 +1,30 @@
+#rad disk
+R_1=15460
+R_12 = 28966
+R_2 = 15257
+R_b = 0
+
+X = R_1*R_2 - R_b*R_12
+Y = R_1*R_2*(R_12+R_b) - R_b*R_12*(R_1+R_2)
+Z = Y*(R_1+R_2 - R_12-R_b)/X**2
+T_d = X*(1-(1-Z)**(1/2))/Y *60
+
+
+print(f't_d = {T_d:.3e}')
+#Exercise 3.1
+print(f'perc deadtime ={T_d*R_12/60*100:.3f}')
+
+#blank disk
+R_1=15280
+R_12 = 29273
+R_2 = 15585
+R_b = 0
+
+X = R_1*R_2 - R_b*R_12
+Y = R_1*R_2*(R_12+R_b) - R_b*R_12*(R_1+R_2)
+Z = Y*(R_1+R_2 - R_12-R_b)/X**2
+T_d = X*(1-(1-Z)**(1/2))/Y *60
+
+print(f't_d = {T_d:.3e}')
+#Exercise 3.1
+print(f'perc deadtime ={T_d*R_12/60*100:.3f}')