A has 14 yuan and B has 15 yuan. They want to buy a football together. The price of a football is twice the sum of their money. How much is a football?
甲有14元，乙有15元，俩人要合买一个足球，一个足球的价钱是他俩人钱数总和的2倍，一个足球多少元？
<gadget id="calculator">14 + 15</gadget>
<output>29</output>

<gadget id="calculator">29 * 2</gadget>
<output>58</output>

<result>58</result>