Answers

2016-01-10T12:05:55+08:00
X + 3 + 3 + 3 ... + 3
2 + 3 + 3 + 3 ... + 3

The answer to your question is 32.

You will add 3, ten times (10 days), 3 tourists were added every other day.

(Sorry, can't explain it well. But I hope it helped ☺.)
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