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Question
What is time 15 hours before 11 p.m.?
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Solution 1
15 ≡ x (mod 12)
15 – x = 12n
15 – x is a multiple of 12 x must be 3.
∴ The time 15 hrs before 11 O’clock is 11 – 3 = 8 O’ clock i.e. 8 a.m.
Solution 2
Here,
11 p.m. = 23 hours
∴ The time 15 hrs before 11 O’clock is 23 – 15 = 8 O’clock i.e., 8 a.m.
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