Two numbers are 90% and 75% lesser than the third number. By what percent should the first number be increased so that it becomes equal to the second number?

150%

Let 3rd no. is = 100

ATQ,

          1st    :     2nd      :      3rd

           10   :       25       :      100

             ⇓            ⇓

              ↔ +15 ↔

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

Increased percentage = \(\frac{15}{10}\) × 100 = 150%