Class 1 of three years bought 2 packs of extracurricular books, 3 bundles per pack, 25 books per bundle, and Class 2 of three years bought 100 extracurricular books. Please ask two math questions and answer them.
三年1班买来2包课外书，每包3捆，每捆25本，三年2班买来100本课外书，请你提出两个数学问题，并解答．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">25 * 6</gadget>
<output>150</output>

<gadget id="calculator">150 - 100</gadget>
<output>50</output>

<result>50</result>