A grain store originally had 360 kg of rice and flour, sold 100 kg of flour, and bought 60 kg of rice. At this time, the weight of rice and flour is equal. How much is the original flour in the grain store?
某粮店原有大米和面粉共360千克，卖出面粉100千克，又购入大米60千克，此时大米和面粉的重量相等，粮店原有面粉多少千克？
<gadget id="calculator">360 - 100</gadget>
<output>260</output>

<gadget id="calculator">260 + 60</gadget>
<output>320</output>

<gadget id="calculator">320 / 2</gadget>
<output>160</output>

<gadget id="calculator">160 + 100</gadget>
<output>260</output>

<result>260</result>