Distribute 120 tons of chemical fertilizers to three professional groups A, B, and C according to the ratio of 3:4:5. How many tons of fertilizer can be decomposed by group B.
把120吨化肥按3：4：5分给甲、乙、丙三个专业组，乙组可分化肥多少吨．
<gadget id="calculator">3 + 4 + 5</gadget>
<output>12</output>

<gadget id="calculator">4 / 12</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">120 * (1/3)</gadget>
<output>40</output>

<result>40</result>