Question 830490
This is probably EASIER with algebra than without it.


Two numbers, m and n.
mn=2400;
and 
n=20+m.


What could be easier or simpler than those two small equations?
You simply have this system of simultaneous equations:
----------
{{{mn=2400}}}
----------
{{{n=m+20}}}
---------


Solve for m and n. The simplest thing to do is use the formula for n and substitute into the product equation.
{{{mn=2400}}}
{{{m(m+20)=2400}}}
{{{m^2+20m=2400}}}
{{{m^2+20m-2400=0}}} -------which is either factorable OR can be solved (for m) using the general solution to the quadratic formula.  Once found, use the known m to compute n.