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There are some chickens and rabbits, where the number of legs of chickens is 26 more than the number of legs of rabbits. If there are 306 legs in total, how many rabbits are there?

More than: Nhiều hơn; In total: Tổng số.

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A stationery store had a batch of ball pens. One half and 3 more pens were sold on the first day. One half of the remaining part and 9 more pens were sold on the second day. Finally, 54 ball pens are left. How many ball pen(s) did the stationery store have originally?

One half: Một nửa; More: Nhiều hơn; Remaining: Phần còn lại; Left: Còn lại; Originally: Ban đầu

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John needs 36 days to finish a project. Mary needs 12 days to finish the same project. If John and Mary do the project together, how long do they need to finish it?

Together: Cùng nhau.

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There are 8 blue balls, 7 red balls and 9 green balls in a bag.

At least how many balls should be picked up to ensure there are 2 balls for each color?

At least: Ít nhất; Ensure: Chắc chắn; Each color: Mỗi màu.

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