There are five Sundays in a certain month, and the sum of the five Sundays is known to be 75. What is the last Sunday of this month?
某月有五个星期日，已知五个星期日的和为75，则这个月的最后一个星期日是几号？
<gadget id="calculator">7 + 14 + 21 + 28 + 75</gadget>
<output>145</output>

<gadget id="calculator">1 + 1 + 1 + 1 + 1</gadget>
<output>5</output>

<gadget id="calculator">145 / 5</gadget>
<output>29</output>

<result>29</result>