Question

7. Find the smallest number to which if 4 is added it
becomes divisible by 9, 12, 16, and 18,​

Answer 1

Answer:

9 = 3^2, 12 = 2^2×3, 16 = 2^4, 18 = 2×3^2. Taking LCM = 2^4×3^2 = 144. The smallest number divisible by 9, 12, 16, 18 = 144. The smallest number to which 4 is added = 140.