How many ounces of 1% antifreeze solution must be added to 100 ounces of 40%

Question

antifreeze solution to obtain a 16% antifreeze solution?

how do I set this equation up?

Answer 1

amount of the 1% stuff to be added ---- x ounces

.1x + .4(100) = .16(x + 100)

solve for x

Answer 2

but first change .1x to .01x

...

Answer 3

Thanks Steve, how sloppy of me