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LCM and HCF

Lowest common multiple and highest common factor.

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Q1 · LCM and HCF · EASY
The HCF of two numbers is 12 and their LCM is 180. If one of the numbers is 36, what is the other number?
Q2 · LCM and HCF · MEDIUM
Three bells ring at intervals of 15 minutes, 20 minutes and 25 minutes. If they all ring together at 9:00 AM, at what time will they ring together again?
Q3 · LCM and HCF · MEDIUM
The LCM of two numbers is 12 times their HCF. The sum of HCF and LCM is 403. If one number is 93, find the other number.
Q4 · LCM and HCF · HARD
Find the greatest number that will divide 215, 167 and 135 leaving the same remainder in each case.
Q5 · LCM and HCF · MEDIUM
The HCF of two numbers is 12 and their LCM is 180. If one of the numbers is 36, what is the other number?