"○○○○○○○○" If the 7 ○ in the left picture are regarded as 7 numbers, the average of these 7 numbers is 29, the average of the first three numbers is 25, and the average of the last four numbers What is the number.
"○○○○○○○○"假如把左图的7个○看成7个数，这7个数的平均数是29，前三个数的平均数是25，后四个数的平均数是多少．
<gadget id="calculator">29 * 7</gadget>
<output>203</output>

<gadget id="calculator">25 * 3</gadget>
<output>75</output>

<gadget id="calculator">203 - 75</gadget>
<output>128</output>

<gadget id="calculator">128 / 4</gadget>
<output>32</output>

<result>32</result>