If a number 'a' is divisible by 6 and 21, then find the number by which 5a is divisible.
Show answer & explanation
Correct answer: D
Explanation
The Correct answer is Option 4 i.e. 210.
Given that,
If a number 'a' is divisible by 6 and 21
So, this number 'a' should be LCM of (6 and 21) = 42
Now,
The number '5a' = 5 × 42 = 210
Hence, the number 5a is divisible by 210