A ratio between two numbers is 4:5 and their L.C.M. is 200. The first number is
Choices
A) 60  B) 40  C) 20  D) 15  E) None
Sol.   Let the required numbers be 4x and 5x. Then, their L.C.M. is 20x.   ∴ 20x = 200⇔ x = 10. Hence, the first number is 40.   Answer 40
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A ratio between two numbers is 4:5 and their L.C.M. is 200. The first number is