Seven years ago, the older brother was four times the younger sister. Now the combined age of the siblings is 44. How old is the older brother?
7年前，哥哥的年龄是妹妹的4倍，现在兄妹俩的年龄和是44岁，哥哥今年多少岁？
<gadget id="calculator">44 - 7 - 7</gadget>
<output>30</output>

<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<gadget id="calculator">4 * 6</gadget>
<output>24</output>

<gadget id="calculator">24 + 7</gadget>
<output>31</output>

<result>31</result>