The average amount of grain stored in warehouses A, B, and C is 105 tons. The ratio of grain stored in warehouse A and B is 2:3. The grain stored in warehouse B is 4/5 that of warehouse C. How many tons of grain is stored in warehouse B?
甲、乙、丙三个仓库平均存粮105吨，甲乙两个仓库存粮的比是2：3，乙仓库存粮是丙仓库的(4/5)，乙仓库存粮多少吨？
<gadget id="calculator">8 + 12 + 15</gadget>
<output>35</output>

<gadget id="calculator">3 / 35</gadget>
<output>3/35 = around 0.085714</output>

<gadget id="calculator">105 * (3/35) * 12</gadget>
<output>108</output>

<result>108</result>