Wang Hong and Zhang Li share a total of 20 yuan. If Wang Hong gives Zhang Li 2.5 yuan, they will have the same amount of money. How much money did Wang Hong have?
王红和张丽共有20元钱，如果王红给张丽2.5元后两人的钱数就同样多了．王红原来有多少钱？
<gadget id="calculator">2.5 + 2.5</gadget>
<output>5</output>

<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<gadget id="calculator">25 / 2</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>