What is the product of 280 plus the quotient of 175 divided by 35 and multiplying the sum by 15?
280加上175除以35的商，所得的和乘以15，积是多少？
<gadget id="calculator">175 / 35</gadget>
<output>5</output>

<gadget id="calculator">280 + 5</gadget>
<output>285</output>

<gadget id="calculator">285 * 15</gadget>
<output>4_275</output>

<result>4_275</result>