There are 60 coins of 5 cents and 1 yuan, and the total amount of money is 50 yuan. How much is the 1 yuan coin?
5角和1元的硬币共60枚，总钱数为50元，其中1元的硬币多少元？
<gadget id="calculator">60 * 0.5</gadget>
<output>30</output>

<gadget id="calculator">50 - 30</gadget>
<output>20</output>

<gadget id="calculator">1 - 0.5</gadget>
<output>0.5</output>

<gadget id="calculator">20 / 0.5</gadget>
<output>40</output>

<result>40</result>