There are two barrels of oil, A and B, if A is injected with 15 liters of oil, the two barrels will have the same amount of oil; if another 145 liters of oil is injected into B, the amount of oil in B will be three times that of A. How many liters are there in a barrel of oil? what is the correct formula
有甲、乙两桶油，如果给甲再注入15升油，两桶油就同样多；如果给乙桶再注入145升油，乙桶的油就是甲桶的3倍．原来乙桶油有多少升？正确算式是多少
<gadget id="calculator">145 + 15</gadget>
<output>160</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">160 / 2</gadget>
<output>80</output>

<gadget id="calculator">80 + 15</gadget>
<output>95</output>

<result>95</result>