There are 100 red flowers, 8 fewer yellow flowers than red flowers, 7 fewer purple flowers than yellow flowers, how many fewer purple flowers than red flowers?
红花有100朵，黄花比红花少8朵，紫花比黄花少7朵，紫花比红花少多少朵？
<gadget id="calculator">100 - 91</gadget>
<output>9</output>

<result>9</result>