 
 <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). <hau> Aikin da P ya yi a rana 1 = 1/20 Aikin da Q ya yi a rana guda = 1/12 Aikin da P ya yi a cikin kwanaki 4 = 4 × (1/20) = 1/5 Sauran aikin = 1 <unk> 1/5 = 4/5 Aikin da P da Q suka yi a rana ɗaya = 1/20 + 1/12 = 8/60 = 2/15 Yawan kwanaki P da Q suna ɗaukar don kammala sauran aikin = (4/5) / (2/15) = 6 Jimlar kwanaki = 4 + 6 = 10 Don haka amsar ita ce (E). 