There is a batch of beverages, half of the total sold in the morning is more than 20 bottles, and the remaining half is sold in the afternoon, more than 15 bottles, and there are 75 bottles left. How many bottles of this batch of beverages are there?
有一批饮料，上午售出总数的一半多20瓶，下午售出剩下的一半多15瓶，还剩75瓶，这批饮料原来有多少瓶．
<gadget id="calculator">75 + 15</gadget>
<output>90</output>

<gadget id="calculator">90 * 2</gadget>
<output>180</output>

<gadget id="calculator">180 + 20</gadget>
<output>200</output>

<gadget id="calculator">200 * 2</gadget>
<output>400</output>

<result>400</result>