How do I generate a random number in java between 450 and 150 that is a multiple of 10?

Question

So far I have this code

int w = (int)((450-150)*random()+150);  

This generates a number between 450 and 150... But I have no idea how to make that number a multiple of 10.

Answer 1

Easy. Just generate random numbers between 15 and 45...then multiply by 10:

int w = ((int)((45 - 15) * random() + 15)) * 10;

Answer 2

Pick a random number between 45 and 15 and multiply it with 10 -

int w = (int)((45-15)*random()+15) * 10;