Answer:
see below
Step-by-step explanation:
In clock arithmetics, your answer has to be in the range 0-N where N is the number of hours in your given clock.
If the initial answer < 0, you add N until you get >=0
If the initial answer >= N, subtract N until you get < N.
a) 8 - 11 (12 clock ) = -3, then -3 + 12 = 9
(a) 9 + 10 (18-clock) = 19, then 19 - 18 = 1
B) 4 Divide 9 ( 12 clock ) , 4/9
(B) 2 Divide 5 (13-clock) , 2/5
C) 7 - 6 ( 12 clock ) = 1, fine.
(C) 1 - 5 ( 37 - clock ) = -4, then -4 + 37 = 33
D) 8 Divide 5 ( 12 clock ) = 8/5, fine
( D ) 3 * 9 ( 18 clock ) =27, then 27 - 18 = 9