The school shipped 30 bundles of saplings, 10 in each bundle, and distributed them to the fifth and sixth grades according to the ratio of 3:7. How many saplings will the fifth grade get less than the sixth grade?
学校运来30捆树苗，每捆10棵，按3：7分给五六年级种植，五年级比六年级少分得多少棵树苗？
<gadget id="calculator">30 * 10</gadget>
<output>300</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">300 * (7/10)</gadget>
<output>210</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">300 * (3/10)</gadget>
<output>90</output>

<gadget id="calculator">210 - 90</gadget>
<output>120</output>

<result>120</result>