For a basket of pears, first take out 150 pears, and then take out 60% of the total number. At this time, the remaining pears are just 1/4 of the original total number. How many pears are there in this basket?
一筐梨，先拿出150个，又拿出总个数的60%，这时剩下的梨正好是原来总个数的(1/4)，这筐梨有多少个？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (3/5) - (1/4)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">150 / (3/20)</gadget>
<output>1_000</output>

<result>1_000</result>