1.

a and b together take 5 days to do a work band c takes 7 days to do the same and a and c take 4 days to do it who among these will take the least time if put to do it alone​

Answer»

this is UR answer borahaeStep-by-step explanation:A will TAKE LEAST time.A& B =1DAY=1/5dayB &C= 1 day= 1/7dayC&A= 1 day = 1/4day 2(A+B+C) =1day = 1/5+ 1/7+1/4=28+20+35/140=83/140C= 83/140-1/5=55/140=140/55=230/140 Days A=83/140-1/7=63/140=140/63=214/63DaysB=83/140-1/4=48/140=140/48=244/48 daysThus, A takes least time.



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