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Help Wong cai hong! Anyone can contribute an answer, even non-tutors.
The HCF and LCM of 270 and z are 18 and 5940. Find the value of z.
a x b = HCF x LCM is always true
so, answer is z = 18 x 5940 / 270
why does this work?
you must have already learnt how to find HCF and LCM of 2 numbers by comparing the indices of their prime factors,
do a comparison of prime factors of 270, z, 18, 5940.