and B have 100 kg of oil in total, and 15 kg of oil in B is poured into A. At this time, the oil in A is 4 times that of B. So, how many kilograms of oil is in barrel A more than that in barrel B?
甲、乙两个油桶中共有100千克油，将乙桶中的15千克油注入甲桶，此时甲桶中的油是乙桶中的油的4倍．那么，原来甲桶中油比乙桶中的油多多少千克．
<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">100 / 5</gadget>
<output>20</output>

<gadget id="calculator">4 * 20</gadget>
<output>80</output>

<gadget id="calculator">1 * 20</gadget>
<output>20</output>

<gadget id="calculator">20 + 15</gadget>
<output>35</output>

<gadget id="calculator">80 - 15 - 35</gadget>
<output>30</output>

<result>30</result>