For the school art festival, 20 garlands and 20 colored balls were prepared. It is known that the colored balls are 3.5 yuan each, and the total cost is 100 yuan. How much is each garland?
学校艺术节，准备了花环和彩球各20个，已知彩球每个3.5元，共花去100元，每个花环多少元？
<gadget id="calculator">3.5 * 20</gadget>
<output>70</output>

<gadget id="calculator">100 - 70</gadget>
<output>30</output>

<gadget id="calculator">30 / 20</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>