A number when increased by 50 %, gives 2520. The number is:

Let the number be $ x $
$ x + 50% \text{ of } x = 2520 $
$ x + \frac{50}{100}x = 2520 $
$ x + \frac{1}{2}x = 2520 $
$ \frac{3}{2}x = 2520 $
$ x = \frac{2520 \times 2}{3} $
$ x = 1680 $
Answer = 1680