Answer:
A) 7
B) 1
C)6
D) 7
Step-by-step explanation:
Clock arithmetic is just like the basic arithmetic you know... with one difference... there are no numbers beyond 12 (or 24).
In your question, you seem to indicate to consider only the 12-hour clock system, much like it is used in the USA.
So, every time you pass 12, you start at 1 again. So, your answer has to be under 13. If your answer is still > 12 after you subtracted 12, subtract 12 again, and again, and again, until you get something <= 12.
That's what we call a modulo 12.
A) 8 + 11 = 19... but then you subtract 12... 19 - 12 = 7
B) 4 + 9 = 13, 13 - 12 = 1
C) 7 * 6 = 42, 42 - 12 = 30, 30-12 = 18, 18 -12 = 6
D) 5 * 11 = 55, 55 - 12 = 43, 43 - 12 = 31, 31 - 12 = 19, 19 - 12 = 7
