Question 1190
 Let his original money be 1.
 Monday : 1 - 1/2 left
 Tues: 1/2 - 1/2 * 1/3 = 1/2 - 1/6 = 1/3 left 
 Wen: 1/3 - 1/4 * 1/3 = 1/3 - 1/12 = 1/4 left

 Answer: 1/4 of his original money does he have left