The ratio of three numbers is 5 : 6 : 7, and their L.C.M. is 210. Find their H.C.F. -

Question: The ratio of three numbers is 5 : 6 : 7, and their L.C.M. is 210. Find their H.C.F. -Solution:Let the numbers be 5x, 6x and 7xThen, their L.C.M. = 210xSo,⇒ 210x = 210∴ x = 1∴ The HCF of the numbers is x = 1