If a group of pigeons and sparrows are released according to the ratio of 7:4, there are 120 more pigeons than sparrows. How many pigeons and sparrows are released in total?
若按7：4的比来放飞一群鸽子与麻雀，鸽子就比麻雀多120只，鸽子与麻雀共放飞多少只？
<gadget id="calculator">7 + 4</gadget>
<output>11</output>

<gadget id="calculator">7 / 11</gadget>
<output>7/11 = around 0.636364</output>

<gadget id="calculator">4 / 11</gadget>
<output>4/11 = around 0.363636</output>

<gadget id="calculator">(7/11) - (4/11)</gadget>
<output>3/11 = around 0.272727</output>

<gadget id="calculator">120 / (3/11)</gadget>
<output>440</output>

<result>440</result>