[R] is how much less than the total number of masks sold on Wednesday?

Answer the following questions based on the information given below: A shopkeeper sold two types of masks
i.e. surgical and N95. Number of surgical masks sold on Monday is [P] which is 60 more than the number of N95 masks sold on same day. Number of surgical masks sold on Tuesday is [Q] which is 20% less than that on Monday and number of N95 masks sold on Tuesday is [R]. Total masks sold on Tuesday is 28% less than that on Monday while total masks sold on Tuesday is 432. Number of N95 masks sold on Wednesday is [S] which is 15% more than number of surgical masks sold on same day. Ratio of total masks sold on Monday to Wednesday is 60:43.