I have one solution but I think it's just a wild guessed one. Tell me if I am correct and also if not, then how should it be done?
What I have done is divided 180 by 60 to get 3. Then take lcm of 60 and multiples of 3 one by one until I get 180 as the lcm.
So I would first take the lcm of 60 and 3, then of 60 and 6, then of 60 and 9 after which I would get 180.
Is this the correct way to solve it?
P.S This is just a 1 mark question of one of the paper of O Levels in which calculators are not allowed and not more than 1 or 2 blank lines are given for working :/. Keep that in mind. :P