how do you solve ratios?

I do it different from many people because i do not usually use algebra.

 

My method is very easy and logical.

Take a look at this post that I did recently.

 

http://web2.0calc.com/questions/in-a-school-1620-pupils-the-ratio-of-boys-to-girls-is-4-5-what-is-the-nunber-of-girls-in-the-school#r3