Two numbers 4:5 having LCM=180. What is smallest no.
- 9
- 15
- 36
- 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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