Which number should replace the question mark?

Category: 
Correct Answers: 
59
Points: 
1

Calculate the number 708

NUMBERMANIA: Calculate the number 708 using numbers [9, 3, 2, 4, 15, 50] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Category: 
Correct Answers: 
10
Points: 
2

Calculate the number 5297

NUMBERMANIA: Calculate the number 5297 using numbers [4, 1, 9, 5, 50, 835] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Category: 
Correct Answers: 
0
Points: 
10

Find the ratio of the areas of two squares

Find the ratio of the areas of two squares. Express result to the accuracy of 3 decimal.
Category: 
Correct Answers: 
14
Points: 
1

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.
Category: 
Correct Answers: 
6
Points: 
5
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