Put together several sheets of rectangular paper with a length of 30 cm and a width of 25 cm to form a square. How many sheets of such rectangular paper are needed at least?
把若干张长30厘米，宽25厘米的长方形纸拼成一个正方形，至少要多少张这样的长方形纸？
<gadget id="calculator">25 / 30</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">2 * 3 * (5/6)</gadget>
<output>5</output>

<gadget id="calculator">25 / 25</gadget>
<output>1</output>

<gadget id="calculator">2 * 3 * 1</gadget>
<output>6</output>

<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<result>30</result>