There is a family of four, the members are father, mother, daughter and son. Their combined age this year is 75 years old. The father is 1 year older than the mother, and the daughter is 2 years older than the son. It is known that 4 years ago, the sum of the ages of everyone in the family was 60 years old. Please calculate how old your mother is 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为75岁，其中父亲比母亲大1岁，女儿比儿子大2岁．已知4年前，家里所有人的年龄之和是60岁，请你计算母亲今年多少岁？
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">60 + 16</gadget>
<output>76</output>

<gadget id="calculator">76 - 75</gadget>
<output>1</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">75 - 3 - 5 - 1</gadget>
<output>66</output>

<gadget id="calculator">66 / 2</gadget>
<output>33</output>

<result>33</result>