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Number at the end of the code denotes the number of letters in that code. The capitol letter in the middle of the code denotes the last letter of the word. The symbol in the front of the code denotes the first letter of the word and they are coded as follow, e=%, i=@, m=#, r=&. Here the code for ‘make rapid’ is ‘#E4 &D5’.
X can do a piece of work in 20 days. He worked at it for 5 days and then Y finished it in 15 days. In how many days can X and Y together finish the work?