In a construction company, one skilled laborer can instruct 4 unskilled laborers to complete the plastering work in a building. If the efficiency of one skilled laborer is 4 times that of one unskilled laborer, and a total of 100 laborers (both skilled and unskilled) were sent to complete the work, where x% of the unskilled workers worked for only half a day, and 3/4​ of the work was completed with those workers, find the number of workers who worked the full day.