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53
M: +2.00/-0.50

A is twice as efficient as B, who is thrice as efficient as C. If C alone can complete the task in 30 days, then in how many days can they together complete the task?

[UP Police Constable Official Paper 2019 (Held on: 27 Jan 2019 Shift 1)]
A
B
C
D

EXPLANATION

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