The mother is 28 years older than her daughter this year. Three years later, the mother will be five times as old as her daughter. How old is her daughter this year?
母亲今年比女儿大28岁，3年后母亲年龄是女儿的5倍，今年女儿多少岁？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">28 / 4</gadget>
<output>7</output>

<gadget id="calculator">7 - 3</gadget>
<output>4</output>

<result>4</result>