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To find the LCM, you first need to express the numbers as the product of their prime factors. In this case:
10z = 2x5xz
20x = 2x2x5xz
The next step is to identify the HCF. In this case that's 2x5xz = 10z. Then you multiply the numbers together and divide by the HCF:
10z x 20z/10z = 20z
Thus the LCM of 10z and 20z is 20z.
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