Easy Proportion, but not for me

[SystemaNoob1]

EDIT: Problem Solved please delete.

 

[Dr. Lady]

There's a much easier way to do it with one equation and no proportions. Practice makes word problems easier!

.03*x+.05*(6000-x)=220

 

[SystemaNoob1]

There's a much easier way to do it with one equation and no proportions. Practice makes word problems easier!

.03*x+.05*(6000-x)=220

Actually that looks more complicated to me. My way was right too though, right?

 

[Dr. Lady]

Sure... but you can't always rely on guess and check. In this problem we see that there's a principal, a rate, and an interest. We need a problem that accomadates them and only them, and we happen to have P*r=I, which we just need to modify for our uses. Word problems are almost always best thought of as what variables you have and need, and then what equation you already know that relates them.