urgent math
posted by kari .
in a GIVEN DAY THE MILL TURNS OUT THREE TIMES AS MANY UNITS OF PLYWOOD. IT PROFITS OF $25 ON A UNIT OF LUMBER AND $40 ON A UNIT OF PLYWOOD. HOW MANY OF EACH M UST SELL TO MAKE PROFIT OF $14720 can anyone help im so confused

read your first sentence, it is incomplete and makes no sense.
Please retype your question, and please don't use allcaps. 
a normal working day the mill makes 3 times as many units of plywood as they do lumber.profit of lumber is $25 profit of plywood is $40 how many of each must be sold to obtain a profit of $14790

let the number of lumber units be x
then the number of plywood units is 3x
then 25x + 40(3x) = 14790
solve for x 
so... i just pick any number

no, you solve the equation
( why would you think to just pick any number ??)
25x + 40(3x) = 14790
25x + 120x = 14790
145x = 14790
divide by 145
x = 102
so they should make 102 units of lumber
and 3(102) or 306 units of plywood.
check 102(25) + 306(40) = 14790