河南孟州人在西安？

I need to run some code only 40% of the times, how may i do this?

[Rails] I need to run some code only 40% of the times, how may i do this? i nee开发者_如何学Cd to make some square items, and there can be a max of 5 per row, and a min of 1 per row. then i want to h