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Factors, Multiples, HCF and LCM

Prime/composite numbers, divisibility, HCF and LCM.

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Q1 · Factors, Multiples, HCF and LCM · EASY
Which of the following numbers is a composite number?
Q2 · Factors, Multiples, HCF and LCM · MEDIUM
The HCF of two numbers is 12 and their LCM is 180. If one number is 36, what is the other number?
Q3 · Factors, Multiples, HCF and LCM · MEDIUM
A number is divisible by both 4 and 6. Which of the following must it also be divisible by?
Q4 · Factors, Multiples, HCF and LCM · MEDIUM
Find the smallest number which when divided by 12, 15, and 20 leaves a remainder of 5 in each case.
Q5 · Factors, Multiples, HCF and LCM · HARD
Three bells ring at intervals of 9 minutes, 12 minutes, and 15 minutes respectively. If they all ring together at 8:00 AM, at what time will they ring together again?