The mother said: "I am 5 years younger than my son's age, which is four times the age." The son said: "Mom is 39 years old this year. Guess how old I am?" Write an equivalent relationship. (in words)
妈妈说："我比儿子年龄的4倍小5岁．"儿子说："妈妈今年39岁，猜猜我今年几岁？"要写等量关系．(用文字表示)
<gadget id="calculator">5 + 39</gadget>
<output>44</output>

<gadget id="calculator">44 / 4</gadget>
<output>11</output>

<result>11</result>