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Move +2, +3, and +4 forward for first 3 letters Move -2,-3, and -4 backward for last 3 letters M + 2 = O I + 3 = L N + 4 = R G - 2 = E L - 3 = I E - 4 = A In the same way, A +2 = C R+ 3 = U I + 4 = M S - 2 = Q E - 3 = B D - 4 = Z
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?