Answer to Question #96076 in Algebra for Adedini

Question

Mr A blows every 15 minutes, Mr B every 20 minutes,Mr C every 30minutes, Mr D every 40 minutes, Mr E every 40minutes, if they all blow at 10pm when next will they all blows

Answer 1

The Least Common Multiple for 15, 20, 30 and 40 is 120.

So, the all blow up after 120 min. from 10 pm, i.e. at 12 pm.