Question 1185429

Could you please help me with this 
How many ounces of 1% antifreeze solution must be added to 100 oz of 40% antifreeze solution to obtain a 16% antifreeze solution?

Thank you so much
<pre>Let amount of 1% solution to mix, be S
Then we get: .01S + .4(100) = .16(S + 100)
.01S + .4(100) = .16S + .16(100)
.4(100) - .16(100) = .16S - .01S
.24(100) = .15S
Amount of 1% solution needed, or {{{highlight_green(matrix(1,8, S, "=", .24(100)/.15, "=", "2,400"/15, "=", 160, oz))}}}