 
<translate> Ọrụ P rụrụ n'otu ụbọchị = 1/24 Ọrụ Q rụrụ n'otu ụbọchị = 1/9 Ọrụ R rụrụ n'otu ụbọchị = 1/12 Ọrụ Q na R rụrụ n'otu ụbọchị = 1/9 + 1/12 = 7/36 Ọrụ Q na R rụrụ n'ụbọchị atọ = 3 × 7/36 = 7/12 Ọrụ fọdụrụ = 1 <unk> 7/12 = 5/12 Ụbọchị ole P nwere ike ịrụcha ọrụ fọdụrụ = (5/12) / (1/24) = 10 N'ihi ya, azịza ya bụ (B). <eng> Work done by P in 1 day = 1/24
Work done by Q in 1 day = 1/9
Work done by R in 1 day = 1/12
Work done by Q and R in 1 day = 1/9 + 1/12 = 7/36
Work done by Q and R in 3 days = 3×7/36 = 7/12
Remaining work = 1 – 7/12 = 5/12
Number of days in which P can finish the remaining work = (5/12) / (1/24) = 10
Therefore, the answer is (B). 