4. The ticket price for a friendly football match is 50 yuan. An hour before the game, there were still tickets left, so it was decided to reduce the price. As a result, the number of tickets sold increased by one-third, and the box office revenue increased by one-quarter. Therefore, the price of each ticket was reduced by ( ) yuan.
(A) 10
(B) $\frac{25}{2}$
(C) $\frac{50}{3}$
(D) 25
【Answer】B
【Question Type】Equation
【Analysis】Let there be $\mathrm{x}$ tickets in total, and the remaining tickets are reduced by $\mathrm{y}$ yuan an hour before the game. According to the problem: $\frac{1}{4} \times(x \times 50)=\frac{1}{3} \times[x \times(50-y)], y=\frac{25}{2}$