A piece of iron wire is 90 meters long. Cut it into 3 sections so that each section is 1.5 meters longer than the previous section. How long is the longest section of iron wire in meters?
一根铁丝长90米，将它截成3段，使得每一段都比前一段长1.5米，请问最长的一段铁丝长多少米？
<gadget id="calculator">90 - 1.5</gadget>
<output>88.5</output>

<gadget id="calculator">1.5 + 88.5</gadget>
<output>90</output>

<gadget id="calculator">1 + 1 + 1</gadget>
<output>3</output>

<gadget id="calculator">90 / 3</gadget>
<output>30</output>

<gadget id="calculator">30 + 1.5</gadget>
<output>31.5</output>

<result>31.5</result>