 <translate> Work done by P in 1 day = 1/20
Work done by Q in 1 day = 1/12
Work done by P in 4 days = 4 × (1/20) = 1/5
Remaining work = 1 – 1/5 = 4/5
Work done by P and Q in 1 day = 1/20 + 1/12 = 8/60 = 2/15
Number of days P and Q take to complete the remaining work = (4/5) / (2/15) = 6
Total days = 4 + 6 = 10 So the answer is (E). <yor> Iṣẹ́ tí P ṣe ní ọjọ́ kan = 1/20 Iṣẹ́ tí Q ṣe ní ọjọ́ kan = 1/12 Iṣẹ́ tí P ṣe ní ọjọ́ mẹ́rin = 4 × (1/20) = 1/5 Iṣẹ́ tó kù = 1 <unk> 1/5 = 4/5 Iṣẹ́ tí P àti Q ṣe ní ọjọ́ kan = 1/20 + 1/12 = 8/60 = 2/15 Iye ọjọ ti P ati Q gba lati pari iṣẹ ti o ku = (4/5) / (2/15) = 6 Apapọ ọjọ = 4 + 6 = 10 Nítorí náà ìdáhùn náà ni (E). 