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

### Instruction:
Ethan is reading a sci-fi book that has 360 pages. He read 40 pages on Saturday morning and another 10 pages at night. The next day he read twice the total pages as on Saturday. How many pages does he have left to read?

### Response:
Ethan read a total of 40 pages + 10 pages = <<40+10=50>>50 pages on Saturday.
On the next day, he read a total of 50 pages x 2 = <<50*2=100>>100 pages.
Since the book has 360 pages, Ethan has 360 pages - 50 pages - 100 pages = <<360-50-100=210>>210 pages left to read.
#### 210