A batch of 85 red sweaters and blue sweaters are shipped from the store. The number of red sweaters is 15 more than four times the number of blue sweaters. How many blue sweaters are there?
商店运来一批红毛衣和蓝毛衣共85件，红毛衣的件数比蓝毛衣件数的4倍还多15件，蓝毛衣有多少件？
<gadget id="calculator">85 - 15</gadget>
<output>70</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">70 / 5</gadget>
<output>14</output>

<result>14</result>