Master Zhang produced 1250 parts in July, which is 550 less than twice the production in June. How many parts did Master Zhang produce in June? (solution by equation)
张师傅7月份生产零件1250个，比六月份生产的2倍少550个，张师傅六月份生产零件多少个？(用方程解)
<gadget id="calculator">550 + 1_250</gadget>
<output>1_800</output>

<gadget id="calculator">1_800 / 2</gadget>
<output>900</output>

<result>900</result>