Problem: the ratio of numbers is 5 : 6 and their h . c . f is 4 . their l . c . m is :
Rationale: "let the numbers be 5 x and 6 x . then their h . c . f = x . so , x = 4 . so , the numbers are 20 and 24 . l . c . m of 20 and 24 = 120 . answer : e"
annotated_formula: lcm(multiply(5, 4), multiply(6, 4))