45% of the beads in a box are blue. if there are 36 blue beads in the box, how many beads are there altogether ?

Breaking down the numbers shows that if 45% is 36 beads, then 5% is 4 beads (divide by 9). Then multiply 5% by 20 (to get 100%) and 4 beads by 20 (distributive property) to have 80 beads. 

You're doing something i dont know how to do but search up on google slope calculator maybe that will get you there