The original weight of apples in the fresh fruit store is 2.5 times that of pears. When the weight of apples sold is 4 times that of pears, the remaining weight of apples is twice the weight of pears. At this time, there are 90 kg of pears left. How many kilograms are pears originally?
鲜鲜水果店原来的苹果重量是梨子的2.5倍，当卖出苹果重量是卖出梨子的4倍时，苹果剩下的重量是梨子剩下重量的2倍，这时梨子剩下90千克，梨子原有多少千克．
<gadget id="calculator">30 + 90</gadget>
<output>120</output>

<result>120</result>