The fruit shop brings in 250 kilograms of pears, and how many kilograms of pears are brought in, the total mass is exactly 4 times the original.
水果店运进250千克梨，再运进多少千克梨，总质量正好是原来的4倍．
<gadget id="calculator">250 * 4</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 - 250</gadget>
<output>750</output>

<result>750</result>