20. The HCF and LCM of two numbers are
917, find the other.
21. Find the least number divisible by 15, 20, 24, 32 and 36.
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Prime factorisation of 15 = 3 × 5
Prime factorisation of 20 = 2 × 2 × 5
Prime factorisation of 24 = 2 × 2 × 2 × 3
Prime factorisation of 32 = 2 × 2 × 2 × 2 × 2
Prime factorisation of 36 = 2 × 2 × 3 × 3
LCM of 15,20,24,32 and 36 = 2 × 2 × 2 × 3 × 3 × 4 × 5 = 1440.
Hence,
The required Number = LCM(15,20,24,32,36) = 1440.
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