30 birds were sitting in a tree. Some more fly up to the tree. Then there were 142 birds in the tree. How many more flew up to the tree? 

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The aquarium opens at 10 o’clock in the morning and closes at 8:30 in the evening. How many hours is it open?

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Emma and Jack each have 2 boxes with 4 red balls each and 9 from last year. How many red balls do they have in total?