The fifth-grade students move bricks. There are 12 people who each move 7 yuan, 20 people who each move 6 yuan, and the rest who move 5 yuan, so there are 148 yuan left. If there are 30 people who each move 8 yuan , there are 8 people who move 9 yuan each, and the rest move 10 yuan each, so there is 20 yuan left. How many students are there in the fifth grade?
五年级学生搬砖，有12人每人各搬7块，有20人每人各搬6块，其余每人搬5块，这样还剩下148块，如果有30人每人各搬8块，有8人每人搬9块，其余每人搬10块，这样就余下20块，五年级有学生多少人？
<gadget id="calculator">7 - 5</gadget>
<output>2</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">6 - 5</gadget>
<output>1</output>

<gadget id="calculator">20 * 1</gadget>
<output>20</output>

<gadget id="calculator">24 + 20 + 148</gadget>
<output>192</output>

<gadget id="calculator">10 - 8</gadget>
<output>2</output>

<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">9 - 8</gadget>
<output>1</output>

<gadget id="calculator">8 * 1</gadget>
<output>8</output>

<gadget id="calculator">8 - 20</gadget>
<output>-12</output>

<gadget id="calculator">60 + (-12)</gadget>
<output>48</output>

<gadget id="calculator">192 + 48</gadget>
<output>240</output>

<gadget id="calculator">240 / 2</gadget>
<output>120</output>

<result>120</result>