In a general cleaning, some students were assigned to wipe the glass. If two of them wiped 4 pieces each, and the rest wiped 5 pieces each, there would be 12 more pieces of glass that no one wiped; Finished. How many pieces of glass do you need to clean in total?
在一次大扫除中，一些同学被分配擦玻璃，他们当中如果有2人各擦4块，其余的人各擦5块，就会多下12块玻璃没有人擦；如果每人擦6块，刚好擦完．一共要擦多少块玻璃？
<gadget id="calculator">5 - 4</gadget>
<output>1</output>

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

<gadget id="calculator">12 - 2</gadget>
<output>10</output>

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

<gadget id="calculator">10 / 1</gadget>
<output>10</output>

<gadget id="calculator">10 * 6</gadget>
<output>60</output>

<result>60</result>