25% is also equal to 1/4. This is because % really means "over 100" so 25/100 simplified is 1/4.
If 1/4 of a number is 13, we can set up the equation, (1/4)x=14, where x is the original number. Multiplying by 4 to cancel out the fraction, we get that x=56, which is your answer.
:)