There is a family of four, the members are father, mother, daughter and son. Their ages are added up this year, and the total is 75 years old. The father is 3 years older than the mother, and the daughter is 2 years older than the son. It is also known that 4 years ago, the sum of all the ages in the family was 60 years old. Please calculate, how old is mother this year?
有一个四口之家，成员为父亲、母亲、女儿和儿子，今年他们的年龄加在一起，总共75岁．其中父亲比母亲大3岁，女儿比儿子大2岁．又知4年前，家里所有的年龄之和是60岁．请计算，母亲今年多少岁？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">75 - 3 - 5 - 3</gadget>
<output>64</output>

<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">64 / 2</gadget>
<output>32</output>

<result>32</result>