A bottle of juice can exactly fill 10 cups, Xiaoming drank 3 cups, Xiaobing drank 4 cups, how much of the bottle of juice did they drink together?
一瓶果汁恰好可倒满10杯，小明喝了3杯，小兵喝了4杯，两人共喝了这瓶果汁的几分之几？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">4 / 10</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/10) + (2/5)</gadget>
<output>7/10 = around 0.7</output>

<result>7/10 = around 0.7</result>