Find the right combination

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
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Correct Answers: 
10
Points: 
2

GUESS THE NUMBER: When you increase this four-digit number four times you got the same number in reverse order

GUESS THE NUMBER: When you increase this four-digit number four times you got the same number in reverse order
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Correct Answers: 
17
Points: 
1

Which number should replace the question mark?

Which number should replace the question mark?
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Correct Answers: 
2
Points: 
9

Find the area of the shaded figure

Express result to the accuracy of 3 decimal.
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Correct Answers: 
39
Points: 
1

Calculate the number 4160

NUMBERMANIA: Calculate the number 4160 using numbers [2, 3, 3, 3, 11, 826] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
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Correct Answers: 
1
Points: 
10
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