Master Zhang wants to produce 90 parts. He produced (1/5) of the total number on the first day, and the number produced on the second day is equivalent to (2/3) of the first day. How many parts did he produce on the second day?
张师傅要生产90个零件，他第一天生产了总数的(1/5)，第二天生产的个数相当于第一天的(2/3)，第二天生产了多少个零件？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">90 * (1/5) * (2/3)</gadget>
<output>12</output>

<result>12</result>