Given: 50% of a number A is added to B The second number B increase by 25% Calculation: When 50% of one number is added to a second number, the second number increase to 25%. Let one number be 'x' and second number be 'y' According to the statement, ⇒50%ofx+y=(125/100)×y Solving the equation, ⇒(50/100)x=(5/4)y–y ⇒x/2=y/4 ⇒x/y=1/2 Hence, The ratio between the numbers A and B is 1:2.