Two warehouses, A and B, store rice respectively, and warehouse A stores 90 tons of rice. The rice in warehouse A (2/3) is equal to the rice in warehouse B (4/5). How many tons more rice in warehouse A than in warehouse B?
甲、乙两个仓库分别存有大米，其中甲仓库存有大米90吨．甲仓库大米的(2/3)和乙仓库大米的(4/5)相等，甲仓库的大米比乙仓库多多少吨？
<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">90 * (5/6)</gadget>
<output>75</output>

<gadget id="calculator">90 - 75</gadget>
<output>15</output>

<result>15</result>