Three numbers are in the ratio of 3 : 4 : 6 and their product is 1944. The largest of these numbers is :___________?

A. 6
B. 12
C. 18
D. None of these

Let the numbers be 3x, 4x and 6x.
Then, 3x x 4x x 6x = 1944 72x³ = 1944
x³ = 27 ,=> x = 3
∴ Largest number = 6x = 18,