A volleyball weighs 285 grams, which is exactly 5 times the weight of a tennis ball. How many grams does this tennis ball weigh?
一只排球重285克，它刚好是一只网球重量的5倍，这只网球重多少克？
<gadget id="calculator">285 / 5</gadget>
<output>57</output>

<result>57</result>