In the parking lot, there are 153 cars with odd number plates, and 15 cars with odd number plates that are three times as many as even number plates. How many cars are there with even number plates?
停车场上，车牌号是单数的车有153辆，单数的车牌号是双数的车牌号的3倍多15辆，车牌号是双数的车有多少辆？
<gadget id="calculator">153 - 15</gadget>
<output>138</output>

<gadget id="calculator">138 / 3</gadget>
<output>46</output>

<result>46</result>