00:02
A job could be done by 11 workers in 15 days.
00:05
Five workers started the job.
00:07
They were reinforced with four more workers at the beginning of the sixth day.
00:11
We're going to find the total number of days it took them to finish the job.
00:15
So in one day, 11 workers can do one 15th part of the work.
00:21
In one day then, one worker, so this is for 11 workers.
00:34
So one worker then does one over 15 times 11, which is one over 165.
00:51
So one worker in one days does one over 165 parts of the work.
00:57
In five days, five workers can do five times five over 165, which gives us five over 33.
01:11
So so far, after five days, they have five 30 thirds of the work done.
01:15
Then the remaining part of the work, so the remaining work is one, that's, that's the total job, one total job minus what they've done so far, 5 .30 thirds, which gives us 33 minus 5 over 33, which gives us 28 over 33.
01:45
And we know that, we know that one worker can do one over 165 parts of the work in one day...