Angelica would have painted the bedroom in 20 hours if every hour she painted 1/20. But she doesn't paint 1/20 of a room per hour but rather 30 minutes. That means it will take her 10 hours to paint the whole room.
Hope this helps.
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hope that helps!!
19 = 19/1 = 38/2 = 57/3 = 76/4
Put this into a scientific calculator
1/3 x pi x 18 squared x 16
