## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Represent the unknown: Let $x$=the number of words he has written Since he still has to write three times as many words as he has written, then he still has to write $\color{blue}{\bf{3x}}$ words. The total number of words is 1000, thus, $x+ 3x = 1000 \\4x=1000 \\\frac{4x}{4}=\frac{1000}{4} \\x=250$ Therefore, he has written 250 words already.