Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
Gunner has a box of mittens with 20 fewer pairs than a box of plugs. He decides to put 30 more pairs of plugs into the box of plugs. If the box of mittens has 150 pairs of mittens, how many plugs are there?

### Response:
The box of mittens has 150 pairs of mittens, and there are 20 fewer mittens pairs than the plugs, meaning there are 150+20 = <<150+20=170>>170 pairs of plugs.
If Gunner decides to add 30 more plugs into the box of plugs, the number of plugs in the box increases to 170+30 = <<170+30=200>>200
Since a pair has two, the 200 pairs of plugs total 200*2 = <<200*2=400>>400 plugs.
#### 400