A bird eats 7 berries a day. Samuel has 5 birds. How many berries do Samuel's birds eat in 4 days? Let's be accurate as possible.
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A bird eats 7 x 4 = 28 berries in 4 days. So, 5 birds can eat 28 x 5 = 140 berries in 4 days.
The answer: 140.
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