There are 15 ham sausages, Xiao Ning gets 1/3 of them, Xiao Yu gets 1/5 of them, and the rest goes to Xiao Huan. How many hams does Xiao Huan get?
有15根火腿肠，小宁分到其中的(1/3)，小雨分到其中的(1/5)，剩下的全部分给小欢，小欢分到多少根？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/3) - (1/5)</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">(7/15) * 15</gadget>
<output>7</output>

<result>7</result>