The proportion among three numbers is 3 : 4 : 5 and their LCM is 1800. The second number is:
Answer & explanation
Correct answer: option 3
The proportion among three numbers is 3 : 4 : 5 and their LCM is 1800. The second number is =
Let the numbers be 3m, 4m, and 5m respectively.
= LCM of (3m, 4m, 5m) = 1800
= 60m = 1800, m = 30
=So, the second number = 4m = 120