There is always going to be a LCM. Just multiply the two numbers together to get the a common multiple if you cant find one because the two numbers multiplied together is a common multiple.
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Since 20z is a multiple of 10z, it is automatically the LCM of this problem.
Since 100p3 is a multiple of 20p, it is automatically the LCM of this problem.
Since 616 is a multiple of 8, it is automatically the LCM of this problem.
Since 22 is a multiple of 11, it is automatically the LCM of this problem.
Since 122 is a multiple of 61, it is automatically the LCM of this problem.