There are 750 original pine and cypress trees in the New Century Ecological Forest, of which pine trees account for 40%. How many cypress trees are there?
新世纪生态林中原有松树和柏树共750棵，其中松树占40%，柏树有多少颗？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">750 * (2/5)</gadget>
<output>300</output>

<gadget id="calculator">750 - 300</gadget>
<output>450</output>

<result>450</result>