1.

1). 172). 163). 144). 13

Answer»

(A + B)’s 2 day’s work $( = \FRAC{1}{{15}} + \frac{1}{{20}} = \frac{7}{{60}})$

Work done in 8 pairs of DAYS $( = \left\{ {\frac{7}{{60}} \times 8} \RIGHT\} = \frac{{14}}{{15}})$

REMAINING work $( = \left\{ {1 - \frac{{14}}{{15}}} \right\} = \frac{1}{{15}})$

Work done by A on 17th day $( = \frac{1}{{15}})$

Total time taken = 17 days.



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