In the ratio 3:5=18:30, if the first item is enlarged to 3 times of the original, how many times should the second item be enlarged, and the ratio still holds.
在比例3：5=18：30中，如果第一项扩大到原来的3倍，那么第二项应扩大多少倍，比例仍然成立．
<result>3</result>