fruit wholesale store buys 1,000 kilograms of oranges for 800 yuan, selects some high-quality oranges, and uses the rest as ordinary oranges. High-quality oranges are sold for 1.5 yuan per kilogram, and ordinary oranges are sold for 1 yuan per kilogram. The result is a net profit of 375 yuan. How many kilograms of high-quality oranges can you choose?
某水果批发商店用800元买进1000千克桔子后，先从中选出部分优质桔子，余下的作为一般桔子．优质桔子每千克卖1.5元，一般桔子每千克卖1元，结果净赚375元，求从中选出多少千克优质桔子？
<gadget id="calculator">375 - 1_000</gadget>
<output>-625</output>

<gadget id="calculator">800 + (-625)</gadget>
<output>175</output>

<gadget id="calculator">1.5 - 1</gadget>
<output>0.5</output>

<gadget id="calculator">175 / 0.5</gadget>
<output>350</output>

<result>350</result>