Q:  Solve m=xy/n for n

A:  OK.  Time to get n by itself.  Well, we are going to “cross multiply” on this one.  Cross multiplying is when you multiply across an equals sign like so:

a/b = c/d

Cross multiply:

ad = bc

The color are there to help you see what multiplies what.

So, we have:

m = xy / n

m/1 = xy/n

Cross multiply

m*n = 1*xy

mn = xy

And, now divide both sides by m (to get n by itself)

n = xy/m