The ratio of the original oil quantity of A and B oil depots is 5:3. Due to production needs, 90 barrels of oil have been transferred from A depot. At this time, A and B depots have the same amount of oil. Find the number of barrels of oil in B depot ?
甲、乙两油库原存油数量的比是5：3，现因生产需要，从甲库调出了90桶油，这时甲、乙两库油数相等，求乙库原有油多少桶？
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">90 / 2</gadget>
<output>45</output>

<gadget id="calculator">45 * 3</gadget>
<output>135</output>

<result>135</result>