By Ajay Kumar

Verified by Ajay Kumar

Which of the following is the smallest number divisible by 9, 12, and 15 and leaves a remainder of 4 in each case?

  1. 158

  2. 184

  3. 78

  4. 88

Answer: B

Solution

Find the LCM of 9, 12, and 15. \(9=3^2\), \(12=2^2\times3\), and \(15=3\times5\). Therefore, \(\operatorname{LCM}=2^2\times3^2\times5=180\). Adding the required remainder gives \(180+4=184\). Trick: Add the common remainder to the LCM.

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