Half of 340 gallons is:
![170\text{ gallons.}](https://img.qammunity.org/2023/formulas/mathematics/college/u5iksrrw4n8p4ylod6ealnawcztr8p6xni.png)
Let x represent the amount of oil in the second tank, we know that at least 170 gallons were pumped into the first tank, therefore, at most the other half is in the second tank:
![x\ge170.](https://img.qammunity.org/2023/formulas/mathematics/college/b9gdv7zy7n3ex1r64yzkvkuq3efz91rq4s.png)
Answer: The above inequality in the number line is represented as follows: