This year's mother is 27 years older than her daughter. This year's mother is exactly 4 times her daughter's age. After a few years, her daughter will be 15 years old.
今年妈妈比女儿大27岁，今年妈妈的年龄正好是女儿的4倍，再过多少年，女儿15岁．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">27 / 3</gadget>
<output>9</output>

<result>9</result>