There are 700 grams of brine with a concentration of 2.5%, how many grams of water must be evaporated from it in order to make brine with a concentration of 10%?
有浓度为2.5%的盐水700克，为了制成浓度为10%的盐水，从中要蒸发掉多少克水？
<gadget id="calculator">2.5 / 100</gadget>
<output>0.025</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">0.025 / (1/10)</gadget>
<output>0.25</output>

<gadget id="calculator">700 * 0.25</gadget>
<output>175</output>

<gadget id="calculator">700 - 175</gadget>
<output>525</output>

<result>525</result>