The efficiency of A, B, and C is 2 : 3 : 5. A alone can complete a work in 50 days. They all work together for 5 days and then C left the work, in how many days A and B together can complete the remaining work?
A50 days
B30 days
C20 days
D10 days
A50 days
B30 days
C20 days
D10 days
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