There are two upright wooden sticks in a pool, one end of the stick is close to the bottom of the pool, and the other end is above the water. The ratio of the lengths of the two sticks out of the water is 7:3. If the water level in the pool rises by 70 centimeters, the ratio of the lengths of the parts of the two sticks above the water is 7:2. So what is the sum of the lengths of the two sticks out of the water?
在一个水池中有两根直立的木棍，木棍的一端紧贴着池底，另一端都露在水面上．两个木棍露出水面部分的长度之比是7：3．如果现在水池中的水面向上涨70厘米，这时两根木棍露出水面的部分的长度之比是7：2．那么原来这两根木棍露出水面部分的长度和是多少厘米？
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">(7/2) * 70</gadget>
<output>245</output>

<gadget id="calculator">245 - 70</gadget>
<output>175</output>

<gadget id="calculator">(7/2) * 3</gadget>
<output>21/2 = around 10.5</output>

<gadget id="calculator">(21/2) - 7</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">175 / (7/2)</gadget>
<output>50</output>

<gadget id="calculator">10 * 50</gadget>
<output>500</output>

<result>500</result>