There is a batch of apples and pears in the fruit shop, 80 kg of pears are sold in the morning, and the weight ratio of the remaining pears to apples is 4:5; another 210 kg of apples are sold in the afternoon, and the weight of the remaining apples is (1/5) of the pears ． How many kilograms of original pears are there in the fruit shop?
水果店有一批苹果和梨，上午卖出80千克梨，余下的梨和苹果的重量比是4：5；下午又卖出210千克苹果，剩下的苹果的重量是梨的(1/5)．水果店原有梨多少千克？
<gadget id="calculator">21 / 20</gadget>
<output>21/20 = around 1.05</output>

<gadget id="calculator">210 / (21/20)</gadget>
<output>200</output>

<gadget id="calculator">200 + 80</gadget>
<output>280</output>

<result>280</result>