There are 40 pieces of glass in a box, each piece is 20 decimeters long, 15 decimeters wide, and 0.04 decimeters thick. It is known that 1 cubic meter of glass weighs 2.6 tons. How many tons does this box of glass weigh?
一箱玻璃有40块，每块长20分米，宽15分米，厚0.04分米．已知1立方米玻璃重2.6吨．这箱玻璃重多少吨？
<gadget id="calculator">40 / 1_000</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">20 * 15 * 0.04 * (1/25) * 2.6</gadget>
<output>1.248</output>

<result>1.248</result>