The mother has two children, and her age this year is five times that of the eldest son. Six years later, she was four times as old as her daughter. If the eldest son is 3 years older than the daughter, how many years later will her age be the sum of the two children?
妈妈有子女两名，她今年的年岁是大儿子的5倍．6年后，她的年岁是女儿的4倍．如果大儿子比女儿年长3岁，问多少年后她的年岁是两名子女的和﹖
<gadget id="calculator">4 * 6</gadget>
<output>24</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">24 - 6 - 12</gadget>
<output>6</output>

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

<gadget id="calculator">6 / 1</gadget>
<output>6</output>

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

<gadget id="calculator">6 - 3</gadget>
<output>3</output>

<gadget id="calculator">6 + 3</gadget>
<output>9</output>

<gadget id="calculator">30 - 9</gadget>
<output>21</output>

<result>21</result>