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Một giờ người thứ nhất làm được \(1:\frac{2}{5}\) = \(\frac{5}{2}\left(cv\right)\)
=> 12 min người thứ nhất làm được \(\frac{5}{2}.\frac{1}{5}\)=\(\frac{1}{2}\left(cv\right)\)
Số phần công việc còn lại: \(1-\frac{1}{2}=\frac{1}{2}\)
Người thứ hai làm một mình hết: \(1:[(\frac{1}{2}:\frac{1}{9})-\frac{5}{2}]\) =\(\frac{1}{2}\) (h)
1. Can Peter repair the bike ? ( skilful )
~> No , he ________________________isn't skilful enough to repair it.
2. Will you take a rest after lunch ? ( tired )
~> Yes , I _________________am tired enough to take a rest after lunch.
3. Can I work with these men ? ( old )
~> No , you _____________________aren't old enough to work with him
4 . Can she join our club ? ( old )
~> Yes, she ______________is old enough to join our club.
5. Can they hang the picture on the wall ? ( tall )
~> No, they ___________________ aren't tall enough to hang it on the wall.
6. Did you wear this coat last winter ? ( cold )
~> No , it was ________________ cold enough to wear this coat.
7. Can you listen to the music on the radio ? ( clear )
~> No, it ___________________ isn't clear enough to listen to the music on the radio
8. Will you buy the new CD of the band ? ( good )
~> Yes, the songs are __________________ good enough to by the new CD of the band.
9. Can we swim early in the morning these days ? ( warm )
~> Yes, the water is______________________ warm enogh to swim in the morning these days.
10. Why don't we sit ouside? ( cool )
~> Yes, it's __________________ cool enough to sit ouside.
If 10 worker take 8 hours to repair a car then 4 worker will take ...20...hours to repair the same car.