To celebrate Children's Day on June 1st, the school prepared 20 garlands and 20 colored balls. The total cost was 100 yuan. The colored balls were 3.5 yuan each. How much is each garland?
为庆祝"六•一"儿童节，学校准备了花环和彩球各20个，共花去100元，彩球每个3.5元，花环每个多少元？
<gadget id="calculator">100 / 20</gadget>
<output>5</output>

<gadget id="calculator">5 - 3.5</gadget>
<output>1.5</output>

<result>1.5</result>