Mom bought the same 3 coats and 4 pairs of trousers for 1662 yuan. It is known that the unit price of each coat is 85 yuan more expensive than the unit price of each pair of trousers. How much is a set of underwear?
妈妈用1662元买了同样的3件上衣和4条裤子，已知每件上衣的单价比每条裤子单价贵85元．一套衣裤要多少钱？
<gadget id="calculator">3 * 85</gadget>
<output>255</output>

<gadget id="calculator">1_662 - 255</gadget>
<output>1_407</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">1_407 / 7</gadget>
<output>201</output>

<gadget id="calculator">201 + 201 + 85</gadget>
<output>487</output>

<result>487</result>