There are 15 pots of orchids in the school botanical garden, which are lantern pots (3/4), and hydrangea pots are lantern flowers (3/5). How many pots of hydrangeas are there in the school botanical garden?
学校植物园里有15盆兰花，是灯笼花盆数的(3/4)，绣球花的盆数是灯笼花的(3/5)，学校植物园里有多少盆绣球花？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">15 / (3/4)</gadget>
<output>20</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">20 * (3/5)</gadget>
<output>12</output>

<result>12</result>