the ratio of numbers is 3 : 4 and their h . c . f is 5 . their l . c . m is :
"let the numbers be 3 x and 4 x . then their h . c . f = x . so , x = 5 . so , the numbers are 15 and 20 . l . c . m of 15 and 20 = 60 . answer : d"
lcm(multiply(3, 5), multiply(4, 5))