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In a hour, Tom and Jack can do: \(\frac{1}{3}\) (the job)
In a hour, Tom can do: \(\frac{1}{4}\) (the job)
So in a hour, Jack can do: \(\frac{1}{3}-\frac{1}{4}=\frac{1}{12}\) (the job)
Thus, if Jack built the same fence alone, it would take 12 hours.
1: Although the car isn’t very nice, it serves its purpose.
2: Although Betty isn’t very tall, she can run very fast.
3: Although he doesn’t have much money, he wants to buy a car.
4: Although there wasn’t much food at the party, everybody had a good time.
5: Although he’s a hard worker, he can never save enough to buy a car.
https://www.facebook.com/viet.hiro.2002 chiều thi có gì bày với nhé
https://www.facebook.com/profile.php?id=100012643830523
kb đuê :v
Ai có thể chịu đựng được chưa
sai r p ak