Xiaohua bought a new box of toothpaste with a net content of 72 cubic centimeters, and the inner diameter of the circular outlet of the ointment is 8 mm. He brushes his teeth in the morning and evening, and the length of the toothpaste squeezed out each time is about 15 mm. How many days can this box of toothpaste last for Xiao Hua? (Take 3 as an approximate value of pi)
小华新买了一盒净含量为为72立方厘米的牙膏，药膏圆形出口的内直径是8毫米．他早晚各刷一次牙，每次挤出的牙膏长约15毫米．这盒牙膏大约能供小华用多少天．(取3作为圆周率的近似值)
<gadget id="calculator">0.72 * 2</gadget>
<output>1.44</output>

<gadget id="calculator">72 / 1.44</gadget>
<output>50</output>

<result>50</result>