A box of thumbtacks weighs 600 grams in total. After taking out 250 pushpins, the rest weighs 525 grams. How many thumbtacks are there in this box?
一盒图钉共重600克，取出250个后，剩下的重525克．这盒图钉共有多少个？
<gadget id="calculator">600 - 525</gadget>
<output>75</output>

<gadget id="calculator">75 / 250</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">600 / (3/10)</gadget>
<output>2_000</output>

<result>2_000</result>