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Two numbers 4:5 having LCM=180. What is smallest no.
  1. 9
  2. 15
  3. 36
  4. 45
Explanation

Let two numbers be 4x and 5x

Their LCM = 180 and HCF = x

Now,

1st number × 2nd number = LCM × HCF

Or, 4x × 5x = 180 × x

Or, 20x = 180

Or, x = 9

Then, the smaller number = 4 × 9 = 36

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