The school bought red and yellow notebooks as prizes. The number of yellow notebooks accounted for 5/9 of the total number. What fraction of the total number of notebooks was red?
学校买来红、黄两种颜色的笔记本做奖品，黄色的个数占总数的(5/9)，红色的数量占总数的几分之几？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 - (5/9)</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>