There are two bookshelves. (2/3) of A bookshelf is equal to (4/5) of B bookshelf. It is known that there are 180 books on A bookshelf, so how many books are there on B bookshelf?
有两层书架，甲书架的(2/3)与乙书架的(4/5)相等，已知甲书架有180本，那么乙书架有多少本？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(2/3) / (4/5)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">180 * (5/6)</gadget>
<output>150</output>

<result>150</result>