1.

Ojha and Bali together can complete a work in 10 days. Ojha alone can complete it in 18 days. If Bali now does the work only for half a day daily, then in how many days Ojha and Bali together will complete the work?1). 13 days2). 11 days3). 12 days4). 10 days

Answer»

Work DONE by Ojha in ONE day = 1/18

Work done by Ojha and BALI together in one day = 1/10

Work done by Bali in one day = (1/10) – (1/18) = 2/45

Work done by Bali in one day if he works for only half day = 2/(2×45) = 1/45

Work done by Ojha and Bali together if Bali works only for half a day daily in one day

= (1/18) + (1/45)

= 7/90

Time taken by Ojha and Bali to complete the work together when Bali works only for half a day

= 1/(7/90) = 90/7 ≈ 13 days


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