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Mathematical application in open recruitment
Solution: If Master Zhang makes a coat in 2x days, then he makes a pair of trousers in (19-2x) days, while Master Wang makes a coat in 3y days and a pair of trousers in (19-y) days.

Because a suit consists of a coat and a pair of trousers.

2x+3y = 2x( 19-2x)+ 19-y

5x+4y=57

x+y=57-x/4

X+y must be an integer.

Therefore, when x= 1, the maximum value of x+y is 14.

Answer: 14 sets of clothes at most 19 days.