Question

What number increased by 15% of itself gives 2921?

Answer 1

Let the number be x.
Therefore,

`x + (15)/(100) xx x` = 291

⇒ `(100x + 15x)/(100)` = 2921

⇒  115x = 2921 x 100

⇒  x = `(2921 xx 100)/(115)`
⇒  x = 2540
Hence, 2540 is the number.