Each red pencil is 0.19 yuan, and each blue pencil is 0.11 yuan. A total of 100 pencils of the two kinds of pencils were bought and 15 yuan was spent. Find the quantity of the two kinds of pencils.
红铅笔每枝0.19元，蓝铅笔每枝0.11元，两种铅笔共买了100枝，花了15元，求两种铅笔的数量．
<gadget id="calculator">0.19 * 100</gadget>
<output>19</output>

<gadget id="calculator">19 - 15</gadget>
<output>4</output>

<gadget id="calculator">0.19 - 0.11</gadget>
<output>0.08</output>

<gadget id="calculator">4 / 0.08</gadget>
<output>50</output>

<gadget id="calculator">100 - 50</gadget>
<output>50</output>

<result>50</result>