AandB take 6 hours and 9 hours respectively to complete a work. A works for 1 hour and then B works for 2hours . (i) How much work is done in these three hours. (ii) How much work is still left.
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Answered by
1
A takes 6 hours to complete the work
So, part of work completed by A in 1 hour= 1/6
Similarly, part of the same work completed by B in 1 hour = 1/9
Work done by A in 1 hour = 1/6
Work done by B in 2 hours = 2/9
Work done in 3 hours = 1/6 + 2/9
=3+4/18
=7/18
Work still left = 1-7/18
=11/18
HOPE IT HELPS..
Answered by
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Answer:
(i) Work done in three hours = 7/18
(ii) Work left = 11/18
Step-by-step explanation:
Take LCM of 6 and 9 = 18
So, let there be 18 works to complete.
A does 18/6 = 3 works in an hour.
B does 18/9 = 2 works in an hour.
So work completed in 3 hours = (1*3 + 2*2)/18 = (3+4)/18 = 7/18
Work left = 1- 7/18 = 11/18
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