Pour (1/3) a glass of salt water and fill it up with water, then pour (1/3) and fill it up with water...a total of five times. At this time, the salt water in the cup contains 0.64 grams of salt, and the poured salt water contains a total of How many grams.
一杯盐水倒(1/3)后用水加满，再倒(1/3)后用水加满…共进行了五次，这时杯中盐水含盐0.64克，则倒去的盐水中含盐共多少克．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">0.64 / (2/3) / (2/3) / (2/3) / (2/3) / (2/3)</gadget>
<output>4.86</output>

<gadget id="calculator">4.86 - 0.64</gadget>
<output>4.22</output>

<result>4.22</result>