mathsscgd
YOUR LINK HERE:
http://youtube.com/watch?v=zTkBKshBf5Y
A and B can do a piece of work in 12 days. B and C can do the work in 15 days. C and A in 20days. In how many days can C alone do it.
видеоклип, споделяне, камера на телефон, видеотелефон, безплатно, качване
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