## Introductory Algebra for College Students (7th Edition)

$8$ is $40$% of $20$.
We start by translating the statement. "$8$ is" means "$8$ =" "$40$% of what number" means "$40$%($x$)" We put both parts of the statement together to get: $8$ = $40$%($x$) We want to change the $40$% into a decimal to be able to work with it more easily. We do this by taking the % sign off and moving the decimal point two places to the left: $$8 = 0.40x$$ Divide both sides by $0.40$ to isolate $x$: $$x = 20$$