Two friends rent an apartment together. They agree that one person will pay 1.5 times what the other person pays. If the rent is $850, how m

Let  x  be the amount that the "other person" pays.

Then 1.5x is the amount of the "one person".

Together they pay $850.00:

--->   x + 1.5x  =  850

--->         2.5x  =  850

--->              x  =  $340.00

--->         1.5x  =  1.5 · 340  =  $510.00