What is the product of the sum of \frac{\begin{array}\\\\2\end{array}}{7} and (1/4) multiplied by 28?
\frac{\begin{array}\\\\2\end{array}}{7}与(1/4)的和乘28，积是多少？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(2/7) + (1/4)</gadget>
<output>15/28 = around 0.535714</output>

<gadget id="calculator">(15/28) * 28</gadget>
<output>15</output>

<result>15</result>