The thickness of 450 sheets of white paper is 2.5 cm. The thickness of the same white paper is 7.5 cm. How many sheets are there?
450张白纸的厚度是2.5厘米，同样的白纸，厚度是7.5厘米，共有多少张？
<gadget id="calculator">7.5 / 2.5</gadget>
<output>3</output>

<gadget id="calculator">3 * 450</gadget>
<output>1_350</output>

<result>1_350</result>