It takes (2/5) decimeter ribbon to fold a small lucky star, which is less (1/3) decimeter than folding a big lucky star. How many big lucky stars can be folded with a roll of 22 decimeter ribbons?
折一个小幸运星要用(2/5)分米的彩带，比折一颗大幸运星少用(1/3)分米．现有一卷22分米的彩带，可以折多少颗大幸运星？
<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">(2/5) + (1/3)</gadget>
<output>11/15 = around 0.733333</output>

<gadget id="calculator">22 / (11/15)</gadget>
<output>30</output>

<result>30</result>