Zhao Fei's family has 6 times more chickens than geese, 7 more ducks than geese, and 13 ducks. How many chickens are there?
赵飞家养鸡的只数是鹅的6倍，鸭比鹅多7只，鸭有13只．鸡有多少只．
<gadget id="calculator">13 - 7</gadget>
<output>6</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<result>36</result>