Chan Yi Xuan's answer to Nathaniel's Secondary 1 Maths Singapore question.
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hope you understand my working! the circled numbers are how you get LCM. Since LCM in this case has prime factors of 3^2 and 7 which is absent in the list of prime factors of 6 and 24, you can confirm that x contains both 3^2 and 7. To obtain the smallest x value, 2 must be included since it is a common prime factor!
Date Posted:
4 years ago
Thanks, but the model answer is 63.