(1) A bat and a ball cost $1.10 in total. The bat costs $1.00 more than the ball. How much does the ball cost?
一个球拍一个球总共是 $1.1, 球拍比球贵 $1, 问一个球多少钱？
(2) If it takes 5 machines 5 minutes to make 5 widgets, how long would it take 100 machines to make 100 widgets?
如果 5 台机器 5 分种能生产 5 个零件，问 100 台机器生产 100 个零件要多少分钟？
(3) In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half of the lake?
湖里长着莲叶，每天，莲叶覆盖的面积都会加倍（是前一天的两倍）。如果莲叶长满整个湖面要用 48 天，问莲叶覆盖半个湖面要多少天？
一个球拍一个球总共是 $1.1, 球拍比球贵 $1, 问一个球多少钱？
(2) If it takes 5 machines 5 minutes to make 5 widgets, how long would it take 100 machines to make 100 widgets?
如果 5 台机器 5 分种能生产 5 个零件，问 100 台机器生产 100 个零件要多少分钟？
(3) In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half of the lake?
湖里长着莲叶，每天，莲叶覆盖的面积都会加倍（是前一天的两倍）。如果莲叶长满整个湖面要用 48 天，问莲叶覆盖半个湖面要多少天？
