There are two piles of stones on the construction site, the first pile weighs 25 tons, and the second pile weighs 40% more than the first pile by 5 tons. How many tons of sand are there in total on the construction site?
工地上有两堆石子，第一堆重25吨，第二堆比第一堆的40%多5吨．工地上共有沙子多少吨？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">25 * (2/5)</gadget>
<output>10</output>

<gadget id="calculator">10 + 5</gadget>
<output>15</output>

<gadget id="calculator">25 + 15</gadget>
<output>40</output>

<result>40</result>