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2,4-d to wheat is effective when it is ap plied at a). 15 DAS b). 20-25 DAS c). 25-30 DAS d). 45 DAS

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2,4-d to wheat is effective when it is ap plied at  
a). 15 DAS
b). 20-25 DAS
c). 25-30 DAS
d). 45 DAS
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c). 25-30 DAS
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P and Q can do a piece of job in 24 days; Q and R can do it in 30 days while R and P can finish it in 40 days. If P, Q, Rworks together, in how many days will they finish the job? In how many days will each one of them finish it, working alone? A) 15,25,35,45 B) 20,30,40,120 C) 20,30,40,50 D) 20,25,30,60

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