Xiaoling is 10 years old this year, her father is 4 times as young as Xiaoling and 3 years younger, and her mother is 3 times as young as Xiaoling. Who is older, father or mother? How big is it?
小玲今年10岁，爸爸是小玲的4倍少3岁，妈妈是小玲的3倍，爸爸和妈妈比，谁的年龄大？大多少？
<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<gadget id="calculator">40 - 3</gadget>
<output>37</output>

<gadget id="calculator">10 * 3</gadget>
<output>30</output>

<gadget id="calculator">37 - 30</gadget>
<output>7</output>

<result>7</result>