The weight of an apple is 15 kg. The weight of a pear is 2/5 of that of an apple and 3/4 of that of a watermelon. How much does the weight of a watermelon weigh in kilograms?
苹果有15千克，梨的重量是苹果的(2/5)，也是西瓜的(3/4)，西瓜重多少千克？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(2/5) / (3/4)</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">15 * (8/15)</gadget>
<output>8</output>

<result>8</result>