Part B (Medium)

Which of the following figures cannot be formed by gluing these two identical squares of paper together?



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Mary, Ann, and Nata work in a kindergarten. Each day from Monday to Friday exactly two of them come to work. Mary works 3 days per week and Ann works 4 days per week. How many days per week does Nata work?



• 1

• 2

• 3

• 4

• 5

Five squirrels A, 8, C, D, and E are sitting on the line. They pick 6 nuts marked by

crosses. At one moment the squirrels start running to the nearest nut at the same

speed. As soon as a squirrel picks a nut it starts running to the next closest nut. Which squirrel will get two nuts?



• A

• B

• C

• D

• E

There are 30 students in a class. They sit by pairs so that each boy is sitting with a girl, and exactly half of the girls are sitting with a boy. How many boys are there in the class?



• 25

• 20

• 15

• 10

• 5

The number 2581953764 is written on a strip of paper. John cuts the strip 2 times

and gets 3 numbers. Then he adds these 3 numbers. Which is the smallest possible

sum he can get?



• 2675

• 2975

• 2978

• 4217

• 4298

Bart is getting his hair cut. When he looks in the mirror the clock looks like:



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| Grandmother bought enough cat food for her four cats to last for 12 days. On her

way home she brought back two stray cats. If she gives each cat the same amount

of food every day, how many days will the cat food last?



• 8

• 7

• 6

• 5

• 4

‘Each letter in BENJAMIN represents one of the digits 1, 2, 3, 4, 5, 6 or 7. Different

letters represent different digits. The number BENJAMIN is odd and divisible by 3.

Which digit corresponds to N?

(một số chia hết cho 3 là khi tổng các chữ số trong số đó là một số chia hết cho 3)



• 1

• 2

• 3

• 5

• 7

Tim, Tom and Jim are triplets, while their brother Caf! is.3 years younger. Which of

the following numbers could be the sum of the ages of the four brothers?



• 53

• 54

• 56

• 59

• 60

The perimeter of the rectangle ABCD is 30cm. Three other rectangles are placed so that their centers are at the points A, B and D (see the figure), The sum of their perimeters is 20cm, What is the total length of the thick line?



• 50cm

• 45cm

• 40cm

• 35cm

• impossible to determine