# QA – Placement Quizzes | LCM | Question 3

Two numbers are in the ratio 3 : 5. If their L.C.M. is 75. what is sum of the numbers?**(A)** 25**(B)** 45**(C)** 40**(D)** 50**Answer:** **(C)****Explanation:** 1st number = 3x

2nd number =5x

LCM of 3x and 5x is 15x

=> 15x = 75

=> x = 5

sum = 15+25 =40