Two numbers are in the ratio 3 : 7. Their L.C.M. is 126. Find the sum of the numbers.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e 60.
Let numbers be 3x and 7x (coprime)
LCM = 21x = 126 ⇒ x = 6
Numbers: 18 and 42 ⇒ Sum = 60