Two kinds of brines containing 16% and 40% of salt are used to mix f kg of brine containing 32% of salt. So, how many kilograms of brine with a salt content of 16% is needed.
现用含盐分别为16%和40%的两种盐水混合含盐32%的盐水f千克．那么，需要含盐16%的盐水多少千克．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>