Two numbers are 30% and 55% lesser than the third number. By what percent should the second number be increased so that it becomes equal to the first number?

55.6%

Let 3rd no. is = 100

ATQ,

          1st    :     2nd      :      3rd

           70   :       45       :      100

             ⇓            ⇓

              ↔ +25 ↔

25 is to be added in 2nd no. so that it becomes equal to 1nd.

Increased percentage = \(\frac{25}{45}\) × 100 = 55.6%