There are three beads of different colors in a jar, among which (2/5) beads are red, (1/3) beads are green, and the remaining 12 beads are yellow. How many beads are there in this jar?
在一个罐子内有三种不同颜色的珠子，其中(2/5)的珠子是红色的、(1/3)的珠子是绿色的、其余的12颗珠子是黄色的．请问这个罐子内共有多少颗珠子．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (2/5) - (1/3)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">12 / (4/15)</gadget>
<output>45</output>

<result>45</result>