Which is a winning combination of digits?

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: 
3
Points: 
8

Which number is missing?

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Correct Answers: 
20
Points: 
1

What is 9 + 5?

If 2+3=10, 8+4=96, 7+2=63, 6+5=66 then 9+5=?
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Correct Answers: 
224
Points: 
1

Calculate a * b

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Correct Answers: 
1
Points: 
10

Calculate the number 1335

NUMBERMANIA: Calculate the number 1335 using numbers [1, 2, 5, 7, 18, 131] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
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Correct Answers: 
0
Points: 
10
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