fruit supermarket purchased 470 kilograms of watermelons, 20 kilograms more than five times the amount of apples purchased. How many kilograms of apples did the supermarket purchase?
某水果超市购进470千克西瓜，比购进的苹果的5倍多20千克，超市购进了多少千克苹果？
<gadget id="calculator">470 - 20</gadget>
<output>450</output>

<gadget id="calculator">450 / 5</gadget>
<output>90</output>

<result>90</result>