What is the number which when increased by 20 is exactly divisible by 18, 56, and 42?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 484.
Factors of 18, 56 and 42,
⇒ 18 = 2 × 3 × 3
⇒ 56 = 2 × 2 × 2 × 7
⇒ 42 = 2 × 3 × 7
L.C.M. of 18, 56 and 42 = 504
Hence,
The required number = 504 - 20 = 484