RRB NTPC 18 January 2017 Paper

Question : 8 of 120

Marks: +1, -0

K and L can do a work in 15 and 20 days respectively. They work together for 5 days and leave. Calculate the unfinished portion of the work.

Solution:

(2) Part of work done by K in 1 day=

1/15

Part of work done by L in 1 day=

1/20

Part of work done by K and L together in 1 day=

1 /15

1/20

7/60

Part of work done in 5 days together=5×

7/60

7/12

Remaining work = 1-

7/12

5/12

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