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v= 2772l
2772-770=2002
2002=22/7×7×7×t
2002=154×t
t=2002/154
t=13dm
= π . r² . t
= 22/7 . 7² . 18
= 2772 liter
volume tabung setelah air terpakai
= 2772 - 770
= 2002
volume = π . r² .t
2002 = 22/7 . 7² . t
t = 2002/154
t = 13 dm