The young pioneers of the three squadrons picked up scrap iron and steel, the first squadron picked up 25% of the total, the ratio of the second squadron to the third squadron picked up kilograms was 7:8, the first squadron picked up less than the third squadron 45 kilograms, how many kilograms did the third squadron pick up?
三个中队的少先队员拾废钢铁，第一中队拾的占总数的25%，第二中队拾的与第三中队拾的千克数的比是7：8，第一中队比第三中队少拾45千克，第三中队拾了多少千克？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">(3/4) * (8/15)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) - (1/4)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">45 / (3/20)</gadget>
<output>300</output>

<gadget id="calculator">300 * (3/4) * (8/15)</gadget>
<output>120</output>

<result>120</result>